calculate the electricity bill amount for a month of april if 4 bulbs of 40watt for 5hours ,4 tubelights of 60watt for 5 ,a T.V of 100 watt for 6hours , a washing machine of 400watt for 3hours are used per day .the cost per unit is ₹ 1.80.
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Answers
Hi.
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Power of 1 bulb = 40 W
Power of 4 bulbs = 4*40 = 160 W or 160/1000 kW
Time = 5 hrs
Energy = P*T = 160*5/1000 = 0.8 units
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Power of 1 tube light = 60 W
Power of 4 tube lights = 4*60 = 240 W = 240/1000 kW
Time = 5 hrs
Energy = P*T = 240*5/1000 = 1.2 units
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Power of TV = 100 W = 100/1000 = 1/10 kW
Time = 6 hrs
Energy = P*T = 6/10 = 0.6 units
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Power of Washing Machine = 400 W = 400/1000 = 4/10 kW
Time = 3 hrs
Energy = P*T = 4*3/10 = 12/10 = 1.2 units
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Total energy used = 0.8 + 1.2 + 0.6 + 1.2 = 3.8 units
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Cost per unit = Rs. 1.8
Total cost = Rs. 1.8 * 3.8 = Rs. 6.84 * 30 = Rs. 205.2 (because April has 30 days.)
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Hope it helps.