Calculate the electricity bill amount for a month of 30days ,if the following devices are used as specified:
1)2 bulbs of 40w for 6hours
2)2 tuvelights of 50w for 8 hours
3)a TV of 120w for 6hours.
Given the cost of electricity is 2.50rps per unit.
Answers
Hi.
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Power of 1 bulb = 40 W
Power of 2 bulbs = 40*2 = 80 W or 80/1000 kW
Time used = 6 hrs
Thus, energy = P*T = (80*60)/(1000) = 4.8 kW H or 4.8 units
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Power of 1 tube light = 50 W
Power of 2 tube lights = 50*2 = 100 W or 100/1000 = 1/10 kW
Time used = 8 hrs
Thus, energy = P*T = 8/10 = 0.8 kW H or 0.8 units
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Power of TV = 120 W or 120/1000 kW
Time used = 6 hrs
Thus, energy = P*T = (120*6)/(1000) = 0.72 kW H or 0.72 units
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Total energy used in a day = 4.8 + 0.8 + 0.72 = 6.32 kW H or 6.32 units
Total energy used in a month = 6.32 * 30 = 189.6 units
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Cost per unit = Rs. 2.5
Thus, total cost = Rs. 2.5 * 189.6 = Rs. 474
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Hope it helps.