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प्रश्न
An electric bulb is rated 220 V; 11 W. The resistance of its filament when it glows with a power supply of 220 V is ______.
विकल्प
4400 Ω
440 Ω
400 Ω
20 Ω
MCQ
रिक्त स्थान भरें
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उत्तर
An electric bulb is rated 220 V; 11 W. The resistance of its filament when it glows with a power supply of 220 V is 4400 Ω.
Explanation:
Given: Power (P) = 11 W
Voltage (V) = 220 V
V = IR
I = `V/R`
According to Ohm’s law:
P = VI
∴ P = `V^2/R`
∴ R = `(220 xx 220)/11`
= 4400 Ω
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