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An ekectric lamp is marked 100W,200V. It is used for 5 hours daily. Calculate 1. its resistance while glowing. 2. energy consumed in kWh per day



(1) _ 200×200÷100
=400 ohms (sinceR=square of voltage ÷power)
(2) energy consumed is=100w×5hour=500wh
1 5 1
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