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1. A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What's the efficiency of the machine? A. 92 percent B. 94 percent C. 97 percent D. 96 percent
A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. [ The efficiency of the machine is 94%. Solution: Efficiency = (output power) / (input power) = (3,760 joule/sec) / (4,000 joule/sec) = 3,760 / 4,000 = 0.94 = 94%. ]
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