Appendix 6 prelab powerpoint
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Transcript of Appendix 6 prelab powerpoint
Electrical Circuits Pre-LabElectrical Circuits Pre-Lab
Constructing and Analyzing Constructing and Analyzing
A Simple Series CircuitA Simple Series Circuit
SafetySafety
Only turn on power after circuit is connectedOnly turn on power after circuit is connected
No loose long sleeves, rings, or braceletsNo loose long sleeves, rings, or bracelets
No food or drinkNo food or drink
Keep miscellaneous objects away from Keep miscellaneous objects away from circuitcircuit
Reverse terminal connections if meter Reverse terminal connections if meter needle moves backwardneedle moves backward
link to electric shock jacket...
MaterialsMaterials
Voltmeter
Voltage Source
Resistors Breadboard
+ =Ammeter
Finding the value of the unknown resistor Finding the value of the unknown resistor using Ohm’s Lawusing Ohm’s Law
Voltage (V) Voltage (V) is measured inis measured in Volts (V) Volts (V) Current (I) Current (I) is measured inis measured in Amperes (A) Amperes (A)
Resistance (R) Resistance (R) is measured inis measured in Ohms (Ω) Ohms (Ω)
Data to CollectData to Collect
2 Resistors connected in series2 Resistors connected in series Measuring resistance, current, and voltageMeasuring resistance, current, and voltage Current ReadingsCurrent Readings
Use the readings from your ammeter to fill out the tableUse the readings from your ammeter to fill out the table
Total Current from Total Current from Ammeter Ammeter (I(ITT))(amps)(amps)
Current in Unknown Current in Unknown Resistor Resistor (I(I11))(amps)(amps)
Current in30 ohm Current in30 ohm Resistor Resistor (I(I22))(amps)(amps)
3030 Ω
Voltage ReadingsVoltage Readings Use the readings from your voltmeter to fill out the tableUse the readings from your voltmeter to fill out the table
Measured Voltage in Measured Voltage in Unknown Resistor Unknown Resistor (V(VRR11)) (volts)(volts)
Measured Voltage in 30 Measured Voltage in 30 ohm Resistor ohm Resistor (V(VRR22) (volts)) (volts)
Total Voltage from Total Voltage from Source Source (V(VTT) (volts) ) (volts)
Data to Collect (cont’d)Data to Collect (cont’d)
CalculationsCalculations
Finding Total Resistance using 2 methodsFinding Total Resistance using 2 methods
Method 1:Method 1:
Method 2:Method 2:
Voltage (V) is measured in Volts (V)Current (I) is measured in Amperes (A)Resistance (R) is measured in Ohms (Ω)
Resistance (R) is measured in Ohms (Ω)
Thought Provoking QuestionsThought Provoking Questions
Similar to lab writeupSimilar to lab writeup If you added another resistor to this circuit, If you added another resistor to this circuit,
what effect would it have on the size of the what effect would it have on the size of the total current? total current?
Use a relevant equation to explainUse a relevant equation to explain If the total voltage supplied to the circuit If the total voltage supplied to the circuit
remained unchanged, how much resistance remained unchanged, how much resistance must be added/subtracted to achieve a must be added/subtracted to achieve a greater/lesser total current? greater/lesser total current?
Lab GroupsLab GroupsDivision of laborDivision of labor
Assign a group member to Assign a group member to one of the following roles:one of the following roles:
Recorder (Records data) Recorder (Records data) Reader (Reads instructions Reader (Reads instructions
and checks off each and checks off each procedure upon completion)procedure upon completion)
Circuit Constructor and Circuit Constructor and Meter ReaderMeter Reader
Switch jobs 3 times during Switch jobs 3 times during lab (V, I, lab (V, I, Ω)
Initial any data that you recorded
Safety Safety RevisitedRevisited
Only turn on power after circuit is connectedOnly turn on power after circuit is connected
No loose long sleeves, rings, or braceletsNo loose long sleeves, rings, or bracelets
No food or drinkNo food or drink
Keep miscellaneous objects away from Keep miscellaneous objects away from circuitcircuit
Reverse terminal connections if meter Reverse terminal connections if meter needle moves backwardneedle moves backward