7.3 voltage and current
Transcript of 7.3 voltage and current
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http://www.youtube.com/watch?v=-n1pSHzdahc
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7.3 Voltage and Current 12 December 2010
The cards have
keywords with more
scientific definitions,
can you match them
up?
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The opposition to the flow of
current
The rate of flow of charge
How much energy each charge
carries
All components are in
a single branch
Components are in
multiple branches
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Aims
• State the equations of current
and voltage in a series circuit
• Describe the changes in
current and voltage in a series
circuit
• Define current and voltage
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For a series circuit:
321 IIII
The current is the same
throughout the circuit
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Current is the rate of flow of charge
t
QI
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Current
The number of
Coulombs flowing
past a point in the
circuit every second.
I = Q/t
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A
I’m counting
how many
coulombs of
electrons go
past me every
second
1 Amp = 1 coulomb per second
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321 IIII
321 VVVV
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For a series circuit:
321 VVVV
The total voltage is the sum
of the individual voltages
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Voltage(emf)
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I’m checking the
difference in
energy (per
coulomb) between
the 2 red arrows
1 Volt = 1 Joule per coulomb
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Voltage (p.d.)
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I’m checking the
difference in
energy (per
coulomb) before
and after the lamp
1 Volt = 1 Joule per coulomb
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Voltage is the energy transferred per charge
Q
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321 IIII
321 VVVV
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I have learned:
I have learned: