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प्रश्न
The resistance of the hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamps, when not in use?
पर्याय
48 Ω
400 Ω
484 Ω
48.4 Ω
MCQ
उत्तर
484 Ω
Explanation:
R = `"V"^2/"P"`
= `(220)^2/100`
= `48400/100`
= 484 Ω
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