Chapter 6 Section 5
Resistance in Series and Parallel Circuits
HW PTG 66 p 658 1-13bull Learning Objective
Explain conservation of energy and conservation of charge in a circuit
bull Success Criteria Assemble a switch in a circuit
with parallel components to control a particular lamp
Use the conservation of energy to determine how currents and voltages are distributed in series and parallel circuits
Use Ohmrsquos Law to derive equations for the total resistance of multiple resistors in series and parallel circuits
bull Do Now 65 Quiz WDYSWDYT p 644
bull Agenda Do Now Investigation 66
Investigation 66bull Step 1 Setup wires and light bulbs as
shown
Investigation 66bull 2 Compare circuit set up
to picture to the rightbull Answer 2a and 2b
bull Write predictions for questions 4 and 5
Investigation 66bull 6 Add voltmeter and take
measurements (use diagram)
bull 7 Add ammeter and take measurements (use diagram)
bull 8 Make predictions and ask teacher to experiment procedure approval
HW PTG 66 p 658 1-13bull Learning Objective
Explain conservation of energy and conservation of charge in a circuit
bull Success Criteria Assemble a switch in a circuit
with parallel components to control a particular lamp
Use the conservation of energy to determine how currents and voltages are distributed in series and parallel circuits
Use Ohmrsquos Law to derive equations for the total resistance of multiple resistors in series and parallel circuits
bull Do Now How do you calculate the
total resistance in a parallel circuit
bull Agenda Do Now Investigation 66
Physics Talk 66bull How do switches work bull Switches are placed in
series with the device they control
bull When the switch is on a copper wire connects the circuit keeping it ldquoclosedrdquo
bull When the switch is off the copper is replaced by an air gap Since air has VERY high resistance the electricity can not travel and the switch is ldquoopenrdquo
Physics Talk 66bull How does current work in
a series circuitbull The same current goes
through each resistor and is equal to the total
bull IT=I1=I2=I3
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
HW PTG 66 p 658 1-13bull Learning Objective
Explain conservation of energy and conservation of charge in a circuit
bull Success Criteria Assemble a switch in a circuit
with parallel components to control a particular lamp
Use the conservation of energy to determine how currents and voltages are distributed in series and parallel circuits
Use Ohmrsquos Law to derive equations for the total resistance of multiple resistors in series and parallel circuits
bull Do Now 65 Quiz WDYSWDYT p 644
bull Agenda Do Now Investigation 66
Investigation 66bull Step 1 Setup wires and light bulbs as
shown
Investigation 66bull 2 Compare circuit set up
to picture to the rightbull Answer 2a and 2b
bull Write predictions for questions 4 and 5
Investigation 66bull 6 Add voltmeter and take
measurements (use diagram)
bull 7 Add ammeter and take measurements (use diagram)
bull 8 Make predictions and ask teacher to experiment procedure approval
HW PTG 66 p 658 1-13bull Learning Objective
Explain conservation of energy and conservation of charge in a circuit
bull Success Criteria Assemble a switch in a circuit
with parallel components to control a particular lamp
Use the conservation of energy to determine how currents and voltages are distributed in series and parallel circuits
Use Ohmrsquos Law to derive equations for the total resistance of multiple resistors in series and parallel circuits
bull Do Now How do you calculate the
total resistance in a parallel circuit
bull Agenda Do Now Investigation 66
Physics Talk 66bull How do switches work bull Switches are placed in
series with the device they control
bull When the switch is on a copper wire connects the circuit keeping it ldquoclosedrdquo
bull When the switch is off the copper is replaced by an air gap Since air has VERY high resistance the electricity can not travel and the switch is ldquoopenrdquo
Physics Talk 66bull How does current work in
a series circuitbull The same current goes
through each resistor and is equal to the total
bull IT=I1=I2=I3
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Investigation 66bull Step 1 Setup wires and light bulbs as
shown
Investigation 66bull 2 Compare circuit set up
to picture to the rightbull Answer 2a and 2b
bull Write predictions for questions 4 and 5
Investigation 66bull 6 Add voltmeter and take
measurements (use diagram)
bull 7 Add ammeter and take measurements (use diagram)
bull 8 Make predictions and ask teacher to experiment procedure approval
HW PTG 66 p 658 1-13bull Learning Objective
Explain conservation of energy and conservation of charge in a circuit
bull Success Criteria Assemble a switch in a circuit
with parallel components to control a particular lamp
Use the conservation of energy to determine how currents and voltages are distributed in series and parallel circuits
Use Ohmrsquos Law to derive equations for the total resistance of multiple resistors in series and parallel circuits
bull Do Now How do you calculate the
total resistance in a parallel circuit
bull Agenda Do Now Investigation 66
Physics Talk 66bull How do switches work bull Switches are placed in
series with the device they control
bull When the switch is on a copper wire connects the circuit keeping it ldquoclosedrdquo
bull When the switch is off the copper is replaced by an air gap Since air has VERY high resistance the electricity can not travel and the switch is ldquoopenrdquo
Physics Talk 66bull How does current work in
a series circuitbull The same current goes
through each resistor and is equal to the total
bull IT=I1=I2=I3
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Investigation 66bull 2 Compare circuit set up
to picture to the rightbull Answer 2a and 2b
bull Write predictions for questions 4 and 5
Investigation 66bull 6 Add voltmeter and take
measurements (use diagram)
bull 7 Add ammeter and take measurements (use diagram)
bull 8 Make predictions and ask teacher to experiment procedure approval
HW PTG 66 p 658 1-13bull Learning Objective
Explain conservation of energy and conservation of charge in a circuit
bull Success Criteria Assemble a switch in a circuit
with parallel components to control a particular lamp
Use the conservation of energy to determine how currents and voltages are distributed in series and parallel circuits
Use Ohmrsquos Law to derive equations for the total resistance of multiple resistors in series and parallel circuits
bull Do Now How do you calculate the
total resistance in a parallel circuit
bull Agenda Do Now Investigation 66
Physics Talk 66bull How do switches work bull Switches are placed in
series with the device they control
bull When the switch is on a copper wire connects the circuit keeping it ldquoclosedrdquo
bull When the switch is off the copper is replaced by an air gap Since air has VERY high resistance the electricity can not travel and the switch is ldquoopenrdquo
Physics Talk 66bull How does current work in
a series circuitbull The same current goes
through each resistor and is equal to the total
bull IT=I1=I2=I3
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Investigation 66bull 6 Add voltmeter and take
measurements (use diagram)
bull 7 Add ammeter and take measurements (use diagram)
bull 8 Make predictions and ask teacher to experiment procedure approval
HW PTG 66 p 658 1-13bull Learning Objective
Explain conservation of energy and conservation of charge in a circuit
bull Success Criteria Assemble a switch in a circuit
with parallel components to control a particular lamp
Use the conservation of energy to determine how currents and voltages are distributed in series and parallel circuits
Use Ohmrsquos Law to derive equations for the total resistance of multiple resistors in series and parallel circuits
bull Do Now How do you calculate the
total resistance in a parallel circuit
bull Agenda Do Now Investigation 66
Physics Talk 66bull How do switches work bull Switches are placed in
series with the device they control
bull When the switch is on a copper wire connects the circuit keeping it ldquoclosedrdquo
bull When the switch is off the copper is replaced by an air gap Since air has VERY high resistance the electricity can not travel and the switch is ldquoopenrdquo
Physics Talk 66bull How does current work in
a series circuitbull The same current goes
through each resistor and is equal to the total
bull IT=I1=I2=I3
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
HW PTG 66 p 658 1-13bull Learning Objective
Explain conservation of energy and conservation of charge in a circuit
bull Success Criteria Assemble a switch in a circuit
with parallel components to control a particular lamp
Use the conservation of energy to determine how currents and voltages are distributed in series and parallel circuits
Use Ohmrsquos Law to derive equations for the total resistance of multiple resistors in series and parallel circuits
bull Do Now How do you calculate the
total resistance in a parallel circuit
bull Agenda Do Now Investigation 66
Physics Talk 66bull How do switches work bull Switches are placed in
series with the device they control
bull When the switch is on a copper wire connects the circuit keeping it ldquoclosedrdquo
bull When the switch is off the copper is replaced by an air gap Since air has VERY high resistance the electricity can not travel and the switch is ldquoopenrdquo
Physics Talk 66bull How does current work in
a series circuitbull The same current goes
through each resistor and is equal to the total
bull IT=I1=I2=I3
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talk 66bull How do switches work bull Switches are placed in
series with the device they control
bull When the switch is on a copper wire connects the circuit keeping it ldquoclosedrdquo
bull When the switch is off the copper is replaced by an air gap Since air has VERY high resistance the electricity can not travel and the switch is ldquoopenrdquo
Physics Talk 66bull How does current work in
a series circuitbull The same current goes
through each resistor and is equal to the total
bull IT=I1=I2=I3
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talk 66bull How does current work in
a series circuitbull The same current goes
through each resistor and is equal to the total
bull IT=I1=I2=I3
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talk 66bull How does current work in
a parallel circuitbull The amount of current
entering the junction must be equal to the current leaving the junction (see diagram)
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talk 66bull Whatrsquos another way to
visualize the current at each junction
bull Each path represents 3 amps of current
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talk 66bull How do you calculate the
total current in a circuitbull IT=I1+I2+I3
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talk 66bull How does voltage work in
a series circuitbull Voltage is split among the
resistors but not always evenly For example for a 6V battery one bulb may get 3V the next 2V and the third 3V
bull VT=V1+V2+V3
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talk 66bull How does voltage work in
a parallel circuitbull The voltage is the same in
each resistorbull VT=V1=V2=V3
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talkbull How do you calculate
resistance in a series circuit
bull How do you calculate resistance in a parallel circuit
bull RT=R1+R2+R3
321
1111
RRRRT
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Physics Talk 66bull How does Ohmrsquos Law
apply
bull How do you calculate power
bull Ohmrsquos law can be applied to the entire circuit or to any resistor in the circuit
bull VT=ITRT
bull V1=I1R1
bull Power can also be calculated for the entire circuit or for any resistor in the circuit
bull PT=ITVT
bull P1=I1V1
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Sample Problem 1bull Given the following series
circuit findbull a) the total resistancebull b) the total currentbull c) the current through
each resistor bull d) the voltage across each
resistorbull e) the total powerbull f) the power dissipated by
each resistor
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Labeling the Diagram
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Sample Problem 2bull Given the following
parallel circuit findbull a) the current through
each resistorbull b) the total currentbull c) the total powerbull d) the power in each
resistorbull e) the total resistance
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Labeling the Diagram
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
Essential Questions
bullP 656 ndash WDYTNbullP 657
What does it meanHow do you knowWhy do you believeWhy should you care
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