Question

Define electric power. Express it in terms of potential difference V and resistance R.

Answer 1

Explanation:

A device of resistance R is connected across a source of V voltage and draws a current I. Derive an expression for power in terms of voltage and resistance.

Answer 2

Answer:

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.