Question

define electric power and express it in potential difference and resistance

Answer 1

electric power is defined as the the rate of doing electrical work.
If I is the current and V is the potential different in V volt and t is the time in second, then
power p= electrical work / time
P= V x I x t / t
p= V x I……………………1)
equation 1 give the expression of electric power in terms of potential different.
but
V = IR [ R is the resistance]
Therfore, p= IxRxI
p= I^2R ………………………2)
equation 2 give the power in term of resistance.

Answer 2

it is the power consumed by the device carries 1a when operated at 1v

 p=vi

consider v

p=v×v/r

p=v²/r

consider I

p=vi

p=I²r

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