Question

the efficiency of 80 percent . what is it mean?
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Answer 1

Explanation:

efficiency of a machine is 80% this means that the total energy produced to the machine only 80% is useful and given as a output .

Answer 2

Answer:

It means that the machine converts 80% of the power of its input fuel source to actual work. There is 20% waste likely as heat, noise or wear.

Note that a machine powered by solar power is considered part of a 100% efficient system because rejected energy dissipated into the environment would have dissipated anyway. A lot of people don’t get this. Solar panels on their own are considered about 8% efficient (over 24 hours) but downstream losses have a different meaning.

Thank you