How much energy is transferred when 10 A current flows through a resistor of 5 ohm for 30 minutes?

1.2 kWh

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0.25 kWh

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0.025 kWh

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3.2 kWh

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Solution

The correct option is C
0.025 kWh

P = I² R = (10)² × 5 = 500 watt = 0.5 kW

t = 30 minute = 0.5 hr

E = P × t = 0.5 kW × 0.5 hr = 0.25 kWh

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