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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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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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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

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