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An Electric Heater is Rated at 2 Kw. Electrical Energy Costs Rs 4 per Kwh. What is the Cost of Using the Heater for 3 Hours? (A) Rs 12 (B) Rs 24 (C) Rs 36 (D) Rs 48 - Science

An electric heater is rated at 2 kW. Electrical energy costs Rs 4 per kWh. What is the cost of using the heater for 3 hours?

(a) Rs 12
(b) Rs 24
(c) Rs 36
(d) Rs 48

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Solution

(b) Rs. 24
Electrical energy consumed in three hours = P x t = 2 kW x 3 hour = 6 kWh
Unit cost = Rs. 4 per kWh
Therefore, the cost of energy used for three hours = 4 x 6 = Rs. 24

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APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 1 Electricity
Q 33
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