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An electric bulb is marked 100 W, 230 V, If the supply voltage drops to 115 V, what is the heat and light

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An electric bulb is marked 100 W, 230 V, If the supply voltage drops to 115 V, what is the heat and light energy produced by the bulb in 20 min :– 

(a) 10 kJ 

(b) 15 kJ 

(c) 20 kJ 

(d) 30 kJ

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Correct option (d) 30 kJ

Explanation:

 

Heat and light energy produced by the bulb in 20 min.

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