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

Electric energy consumed by a heater in one day
= power $\times$ time=2 $\times$ 3=6kwh

so cost=6 $\times$ 4=24 Rs

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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

Electric energy consumed by a heater in one day = power × time=2×3=6kwh so cost=6×4=24 Rs

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

Electric energy consumed by a heater in one day
= power $\times$ time=2 $\times$ 3=6kwh

so cost=6 $\times$ 4=24 Rs