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21/07/2021 7:32 pm
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An electric bulb is rated at 220 V, 100 W. What is its resistance?
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21/07/2021 7:35 pm
V = 220 V, P = 100 W
R = ?
We know that
P = V2/R
Thus
R = V2/P
= 2202/100
= 484 ohm