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Q.

An electric bulb rated for 500 watts at 100 volts is used in a circuit having a 200 volt supply. The resistance R that must be put in series with the bulb so that the bulb draws 500 W is

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a

10  Ω

b

20  Ω

c

50  Ω

d

100  Ω

answer is B.

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Detailed Solution

Rated current through the circuit, i=500100=5APotential difference across  R,  100=5  ×  R⇒ R=20 Ω
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