Question

What is the efficiency of a machine.

Answer 1

Efficiency:

1. The efficiency of a machine is the ratio of the work done on the load by the machine to the work done on the machine by the effort.
2. Thus, it is the ratio of useful work done by the machine output to the work done by the machine input.
3. It is represented by the Greek symbol$\eta \left(eta\right)$.

The formula of efficiency:

1. $\eta =\frac{Outputwokdone}{Inputworkdone}$
2. It is usually expressed as a percentage $\eta =\frac{Outputwokdone}{Inputworkdone}\times 100\%$
3. Since it is a ratio of two similar quantities, it has no unit.