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Q.

A hot electric iron has a resistance of 80 Ω and is used on a 200 V source. The electrical energy spent, if it is used for two hours, will be

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a

8000 Wh

b

800 Wh

c

1000 Wh

d

2000 Wh

answer is C.

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Detailed Solution

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R=80Ω;V=200V;t=2hr;Q=V2Rt=200×20080×2=1000 W−hr

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