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Power is simply the amount of energy used or the amount of "work" a circuit is doing.

Power is represented by the letter P. The basic unit for measuring power is watts or the letter W. To find power, all you need is a simple equation:
P=EI
or Power equals voltage times current.

For example, if
E = 9V
I = 0.5A
 then
P = 9 * 0.5

P = 4.5W


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