Question

Define efficiency of a lever. What is meant by efficiency of a machine is 80% ?​

Answer 1

Answer:

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

$\huge\underline\mathtt{\red{ANSWER}}$

It is usually the ratio of the power delivered by a mechanical system to the power supplied to it, and, because of friction, this efficiency is always less than one. For simple machines, such as the lever and the jackscrew, the efficiency is the actual load lifted divided by the theoretical force delivered.

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.