
A
Electrical power is voltage (V) divided by current (I) (P = V/I). It is measured in watts (W).

B
Electrical power is energy multiplied by time (t) (P = Energy x t). It is measured in watts (W).

C
Electrical power is energy is divided by time (t) (P = Energy/t). It is measured in watts (W).

D
Electrical power is current (I) divided by voltage (V) (P = I/V). It is measured in amperes (A).
Power is the rate of "doing work". It can also be described as the rate of energy transfer, which is the same thing.
Power = Energy Transferred / Time
Power is therefore a measure of how much energy is being transferred into another form per second. It is measured in Watts (W). It is sometimes useful to rearrange this equation to read:
Energy Transferred = Power x Time
In electrical terms, and this applies to any transfer of energy which goes through electrical energy (generators, motors, etc.), the power can also be calculated using the equation:
Power = Voltage x Current
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