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JAMB Physics 2024 Paper

Question : 42

Total: 125

Solution:

Concept:

Electrical energy in kilowatt-hours is calculated by multiplying power in kilowatts by time in hours.

Explanation:

The power of the refrigerator is

150\text{ W}

Convert watts to kilowatts:

150\text{ W} = \frac{150}{1000}\text{ kW} = 0.150\text{ kW}

The time for which it operates is

336

hours.

Energy consumed is given by:

\text{Energy (kWh)} = \text{Power (kW)} \times \text{Time (h)}

Substitute the values:

\text{Energy} = 0.150\text{ kW} \times 336\text{ h}

\text{Energy} = 50.40\text{ kWh}

Answer:

The energy consumed is

50.40\text{ kWh}

, which corresponds to option B.

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