CWEA Maintenance Technologist Practice Test 2025 – Complete Exam Prep

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Question: 1 / 400

What is the total energy used in watts/hour by a 150-watt lamp burning for 8 hours?

1,800 watts/hour

1,200 watts/hour

To determine the total energy consumed by the lamp, you can apply the formula that links power, time, and energy. The energy usage in watt-hours (Wh) is calculated by multiplying the power rating of the lamp (in watts) by the time it is in operation (in hours).

In this case, the lamp has a power rating of 150 watts. If it burns for 8 hours, you would calculate the energy used as follows:

Energy (in watt-hours) = Power (in watts) × Time (in hours)

Energy = 150 watts × 8 hours = 1,200 watt-hours

This calculation shows that the lamp uses a total of 1,200 watt-hours, which is equivalent to the answer choice selected. Thus, the correct response accurately reflects the energy consumption over the specified time period.

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1,500 watts/hour

1,000 watts/hour

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