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Physics

Electric Power

Calculate the...

Question

Calculate the electrical energy used in a month in a house using two bulbs of 100w each and two fans of 60w each. If the bulbs and fans are used for an average of 10 hrs per day. If the cost per unit is Rs.2.10 , calculate the cost per month.

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Solution

electrical energy consumed by 2 bulbs in a day=2Ã—100wÃ—10hr =2000Wh=2kWh
electrical energy consumed by 2 fans in a day=2Ã—60wÃ—10hr =1200Wh=1.2kWh
electrical energy consumed by 2 bulbs in a month(30 days)=electrical energy consumed by 2 bulbs in a day Ã— 30=2kWh Ã— 30
=60kWh
electrical energy consumed by 2 fans in a month(30 days)=electrical energy consumed by 2 fans in a day Ã— 30=1.2kWh Ã— 30
=36kWh
1 unit =1 kWh
total units in month=electrical energy consumed by 2 bulbs in a month(30 days)+electrical energy consumed by 2 fans in a month(30 days)
=60+36=96 units
cost per month=total units Ã— cost of one unit
=96Ã—2.1=Rs 201.6

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