Calculate the electricity bill amount for a month of 31 days , if the following devices are used as specified.
a) 3 bulbs of 40W for 6 hours
b) 5 tubelights of 40W for 6 hours
c) a refrigerator of 400W for 24 hours
given the rate of electricity is rs 2.50 per unit
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Explanation:
Electric energy consumed per day by 3 bulbs = 3x40x6 = 720Wh
Electric energy consumed per day by 5 lights = 5x40x6 =1200 Wh
Electric energy consumed per day by refrigerator = 400x24 = 9600 Wh
.’. Total electric energy consumed by all electric appliances = (720+ 1200 + 9600)Wh = 11520 Wh = 11.52 kWh = 11.52 units
Total electric energy consumed in the month of 31 days = 11.52 x 31 = 357.12 units
Cost of one unit = Rs. 2.50
Cost of 114 units = 357.12 x 2.50
∴ Electricity bill amount = Rs 892.80
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