An electric refrigerator rated 400 W operates 8 hours/day, 4 tubelights
rated 40 W operate 6 hours/day and a TV set rated 250 W operates
4 hours/day. What is the cost of energy to operate them for the month
of November at the rate of 5.00 per kWh?
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Answer:
Energy of one day =Power×Time=400W×8h=3.2KWh
Energy of 30 days =3.2KWh×30=96KWh
So, cost of the energy =96×3=Rs.288
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