An electric heater is rated at 2 KW. Electrical energy costs ₹ 4 per KWh. What is the cost of using the heater for 3 hours?
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Answer: Rs. 24
Explanation:
Electrical energy consumed in three hours= P*t= 2kW * 3hour= 6kW
unit cost =Rs. 4 per Kwh
Therefore, the cost of energy used for three hours = 4 *6 = Rs. 24
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