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# Power in a Circuit

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## Richard Datwyler

on 1 March 2016

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#### Transcript of Power in a Circuit

Power in a Circuit
Power is the rate of energy transfering.
In a circuit the energy is potential energy.
That potential energy is related to the electric potential. Which is constant.
Finally by definition, the change of charge in time is current.
With Ohm's Law it can be written as
How much power is dissipated by each of the resistors shown here?
5
9
3
12 V
R = 7.25
eff
I = 1.655 A
I = 3 I
2
3
I =I + I
3
2
1
1
I = 0.4138 A
I = 1.241 A
2
3
How much resistance is in each light bulb shown here
P = 1.54 W
P = 13.7 W
P = 4.62 W
P = 19.86W
3
2
1
T
120 V
100 W
60 W
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