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Power Delivered and Heat Dissipated in a Circuit

A light bulb ...

Question

A light bulb is rated at 125 W for a 250 V a.c., supply.
Calculate the resistance of the bulb.

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Solution

Power of the bulb, P = 125 W
Voltage, V = 250 V
The resistance of the bulb is given by
$R = \frac{V^{2}}{P} = \frac{(250)^{2}}{125}$
$= 500 Ω$

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