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Electric Power

Mathematical ...

Question

Mathematical expression for electric power(P), where $I$ is current and $R$ is resistance, is;

A

P = I R

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B

P = \frac{I}{R}

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C

P = \frac{R}{I}

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D

P = I^{2} R

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Solution

The correct option is D $P = I^{2} R$
Electric power is given by:
$P = V I$

From Ohm's Law, we know that $V = I R$
Therefore, electric power $= I \times I R = I^{2} R$

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