1 Answers

A body is said to have power of 1 watt if it does work at the rate of 1 joule in 1 s, 

i.e.,  1W=1J/1s

Power is given by the expression, 

Power=Work done /Time 

Work done = Energy consumed by the lamp = 1000 J 

Power=1000 / 10 = 100 Js−1 

= 100 W

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