A 150 watt, 120 volt lamp burns for 8 hours at the rated voltage. What is the energy used in watt-hour (Wh)?

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Prepare for the CWEA Electrical/Instrumentation (E/I) Grade 1 Test. Use flashcards and multiple-choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

A 150 watt, 120 volt lamp burns for 8 hours at the rated voltage. What is the energy used in watt-hour (Wh)?

Explanation:
Energy used is found by multiplying power by time. The lamp is rated at 150 W and runs for 8 hours, so the energy consumed is 150 W × 8 h = 1200 Wh. That’s 1.2 kWh. The other options would require a different combination of power or time (for example, using 150 W for 4 hours would yield 600 Wh, etc.), which doesn’t match the given conditions.

Energy used is found by multiplying power by time. The lamp is rated at 150 W and runs for 8 hours, so the energy consumed is 150 W × 8 h = 1200 Wh. That’s 1.2 kWh. The other options would require a different combination of power or time (for example, using 150 W for 4 hours would yield 600 Wh, etc.), which doesn’t match the given conditions.

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