When a 0.5 kW heater operates for 20 minutes, the electrical energy consumed is equal to ___kJ.

200 kJ

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400 kJ

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600 kJ

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800 kJ

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Solution

The correct option is C
600 kJ

Given,
Power, $P = 0.5 k W = 500 W$
Time, $t = 20 m i n = 1200 s$
Electrical energy consumed in a given time, $H = P \times t = 500 W \times 1200 s = 600000 J = 600 k J$
Hence, energy consumed is equal to 600 kJ.

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