A 2 kW electric heater operates for 45 minutes on its rated supply. How much electrical energy does it consume?
1.5 kWh
Electrical energy in kWh = power in kW × time in hours.
Time = 45 minutes = \(\frac{45}{60}=0.75\) hour.
Energy = \(2 \times 0.75 = 1.5\) kWh.
Hence, the heater consumes 1.5 kWh.
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