A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is

Question

Dr. Abubacker · Accepted Answer

[Solution] I = 500/100 = 5 A; the series resistor drops 130 V, so R = 130/5 = 26 Ω. Answer (3).

Q. A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is

Explanation

Reviewed by Dr. Abubacker

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