A motor has 1,000 watts input and delivers 746 watts output. What is its efficiency?

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Enhance your understanding of the fundamentals of electricity with the AMT General Exam. Study with multiple-choice questions crafted to improve your knowledge and confidence. Prepare effectively for your success!

Multiple Choice

A motor has 1,000 watts input and delivers 746 watts output. What is its efficiency?

Explanation:
Efficiency is the ratio of useful output power to input power, expressed as a percentage. With 1000 watts in and 746 watts out, the efficiency is 746 divided by 1000, which equals 0.746, or 74.6 percent. This means about a quarter of the input power is lost to heat and other losses. The other numbers would imply different output powers (for example, 50% would be 500 W out, 100% would be all 1000 W out, and 25% would be 250 W out), so 74.6 percent is the correct efficiency.

Efficiency is the ratio of useful output power to input power, expressed as a percentage. With 1000 watts in and 746 watts out, the efficiency is 746 divided by 1000, which equals 0.746, or 74.6 percent. This means about a quarter of the input power is lost to heat and other losses. The other numbers would imply different output powers (for example, 50% would be 500 W out, 100% would be all 1000 W out, and 25% would be 250 W out), so 74.6 percent is the correct efficiency.

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