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26/07/2021 2:08 pm
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A 2 kW heater, a 200 W TV and three 100 W lamps are all switched on from 6m. to 10 p.m. What is the total cost at Rs. 5.50 per kWh?
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26/07/2021 2:14 pm
For heater:
P = 2kW, t = 4h
E = P x t
= 2 x 4 = 8kWh
For TV:
P = 200W = 0.2kW, t = 4h
E = P x t = 0.2 x 4
= 0.8kWh
Lamps:
P = 100W = 0.1kW, t = 4h, n = 3
E = n x P x t
= 3 x 0.1 x 4 = 1.2kWh
Total energy consumed = 8 + 0.8 + 1.2
= 10kWh
Cost of 1kWh = Rs. 5.50
Cost of 10kWh = Rs. 5.50 x 10
= Rs. 55