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What is the formula for power in a circuit?

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IR

VI

I^{2} Rt

V \frac{t}{Q}

answer is B.

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Detailed Solution

The formula for electric power is

VI .

Consider the current flowing through a resistor of resistance

R

, is

I

. Let the potential difference across the circuit is

V,

and

t

be the time during which charge Q flows across the circuit. The work done for moving the electric charge

Q

across the potential difference

V

VQ

. Now since power is the work done per unit of time. So,

P = V \frac{Q}{t}

. Therefore

Power (P) = VI

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