1.

An electric bulb rated for 500 W at 100 V is used in a circuit having a 200 V supply. The resistance ‘R’ that must be kept in series with the bulb so that the bulb draws 500 W is …. 1) 30Ω2) 5Ω 3) 10Ω 4) 20Ω

Answer»

Correct option is 4) 20Ω



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