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Electric Power

Relation betw...

Question

Relation between the power (P) consumed by a device, its resistance (R) and voltage (V) across it.

A

P=VR

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B

P = \frac{V^{2}}{R}

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C

P = \frac{V}{t}

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D

None

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Solution

The correct option is B $P = \frac{V^{2}}{R}$
Power consumed by a device $P = V I$
From ohm's law $I = \frac{V}{R}$ $⟹ P = \frac{V^{2}}{R}$

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