# Efficiency of a Pulley in Work Calculation

## Calculating Efficiency of a Pulley

**Efficiency of a pulley** can be determined by comparing the useful work output to the total work input. This calculation provides insight into how effectively the pulley is performing in transferring energy.

Using the given data, where the pulley performed 380 J of work out of a total of 400 J, we can apply the efficiency formula. The formula is efficiency = (useful work output / total work input) x 100%. Substituting the values gives us (380/400) x 100% = 95%. This means that the pulley is 95% efficient in this scenario.

Efficiency is a crucial factor in evaluating the performance of machines and systems. A higher efficiency indicates that the pulley is effectively converting input energy into useful output work. In this case, with an efficiency of 95%, the pulley is operating quite efficiently in its task.