Question

Write the relation of efficiency of an actual machine.

Answer 1

For an actual machine, the efficiency (η) is always less than 100% (or less than 1) due to friction and the weight of moving parts.

Mathematical Relation:

Efficiency (η) = `"Mechanical Advantage (M. A.)"/"Velocity Ratio (V. R.)" < 1`

Alternatively:

Efficiency (η) = `"Work Output"/"Work Input" xx 100%`