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vivado [14]
3 years ago
12

Suppose a vacuum cleaner uses 120 J of electrical energy. If 45 J are used to pull air into the vacuum cleaner, how efficient is

the vacuum cleaner?
Advanced Placement (AP)
1 answer:
BaLLatris [955]3 years ago
3 0
Power efficiency is defined as the ratio of the output power divided by the input power:
Efficiency= out/in • 100%
So, (120 - 45)J / 120J • 100% = 62.5%
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