In a factory, 5 electric bulbs of power 500W are used for 6 hours and a heater of 2kW is uesd for 8 hours in day. Calculate the energy consumed in 30 days and the cost of the electrical energy @ Rs. 5/unit.

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Solution

Here,
Power of 1 bulb = 500 W
Power of 5 bulbs = 5Ã—500 = 2500W
= 2.5 kW
Time the bulbs glow/ day = 6 hr
Energy consumed in kWh = 6Ã—2.5 = 15 kWh
Power of heater = 2kW
Time the heater is kept on / day = 8 hr
Energy consumed in kWh = 8Ã—2 = 16 kWh
Total consumption / day = 16 + 15 = 31 kWh
Total number of units in 30 days = 30Ã—31 kWh
= 930 kWh
Price of 1 kWh = Rs. 5
Price of 930 kWh = Rs. 5 Ã— 930
= Rs. 4650

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