The ratio of output work to input work expressed as a percent is the efficiency of a machine. It <span> is a measurable concept that can be determined by determining the ratio of useful output to total input. Hope this answers the question.</span>
Efficiency of a machine is commonly defined as the ratio of output work (work done by the machine) to work done on the machine (input work) expressed as percent.
The efficiency of a machine offers insight on the level of energy preserved or giving out (lost) in a process.
If we examine a machine subjected to the level of work acted on it. Then the work acted on machine should be W.
The machine does its work as a result of the effort used on it to give the expected outcome. Then, the output formed by the machine should be W' .
