Discussion
An electric heater of 230 V, 5 kW rating is used for hot water generation in an industry. Find the electricity consumption per hour at the rated voltage.
Answer: B
Energy used is power times time. The heater has a rating of 5 kW at the rated voltage of 230 V, so running for one hour at the rated voltage
\[ \begin{aligned} E = P \times t = 5\ \text{kW} \times 1\ \text{h} \\ &= 5\ \text{kWh} \end{aligned} \]
The voltage rating does not change the answer when the heater is run at its rated voltage. The value 2.5 kWh would be for half an hour, and 1 kWh and 0.5 kWh have no basis. The answer is option B.
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