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Electric Power

An electric b...

Question

An electric bulb is rated at 220 V, 100 W. What is its resistance?

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Solution

Given V = 220 V and P = 100 W

We know that power, P = IV = V² / R
R = V² / P

R = $\frac{220 \times 220}{100}$
R = 484 Ώ

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