QuestionAugust 1, 2025

What is the daily cost of an incandescent lamp? a. 0.02 b. 0.17 C. 0.72 d. 8.76

What is the daily cost of an incandescent lamp? a. 0.02 b. 0.17 C. 0.72 d. 8.76
What is the daily cost of an incandescent lamp?
a. 0.02
b. 0.17
C. 0.72
d. 8.76

Solution
4.3(203 votes)

Answer

c. \ 0.72 Explanation 1. Calculate daily energy consumption Assume the lamp uses 60 watts and operates for 8 hours a day. Energy consumed = 60 \text{ watts} \times 8 \text{ hours} = 480 \text{ watt-hours} or 0.48 \text{ kWh}. 2. Calculate daily cost Assume electricity cost is \0.15 per kWh. Daily cost = 0.48 \text{ kWh} \times \0.15/\text{kWh} = \0.072.

Explanation

1. Calculate daily energy consumption<br /> Assume the lamp uses 60 watts and operates for 8 hours a day. Energy consumed = $60 \text{ watts} \times 8 \text{ hours} = 480 \text{ watt-hours}$ or $0.48 \text{ kWh}$.<br />2. Calculate daily cost<br /> Assume electricity cost is $\$0.15$ per kWh. Daily cost = $0.48 \text{ kWh} \times \$0.15/\text{kWh} = \$0.072$.
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