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JAMB Physics 2024 Paper

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Question : 87

Total: 125

A particular household utilizes three electrical appliances for six hours daily if the appliances are rated 80W, 100W, and 120W respectively. Calculate the electrical bills paid monthly if an average month is 31 days. [1kwh = #24.08k]

₦ 2843.22k
₦ 1950.22k
₦ 1343.66k
₦ 46.23k

Solution:

Concept:

Total electrical energy used per month is found from total power, daily hours, and number of days.

Explanation:

Total power of the appliances is:

80\text{W} + 100\text{W} + 120\text{W} = 300\text{W}

Convert to kilowatts:

300\text{W} = 0.3\text{kW}

Energy used per day:

0.3\text{kW} \times 6\text{h} = 1.8\text{kWh}

Energy used in 31 days:

1.8\text{kWh} \times 31 = 55.8\text{kWh}

Monthly cost at

₦24.08

per kWh:

55.8 \times 24.08 = ₦1343.664\text{k}

This is approximately

₦1343.66\text{k}

.

Answer:

₦1343.66k — Option C.

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