Efficiency is calculated using which of the following formulas?

The calculation of efficiency is fundamentally about comparing useful output to total input, which provides a measure of how effectively energy is being utilized in a system. In this case, the correct formula for calculating efficiency is the one that expresses the percentage of useful energy produced relative to the total energy used.

Using the formula, the percentage of efficiency indicates how much of the total energy consumed is converted into useful energy. The value is often expressed as a percentage, which is useful for assessing the performance of machines, engines, or systems in a variety of applications.

This understanding of efficiency is vital, particularly in fields such as engineering, physics, and environmental science, where maximizing efficiency can lead to better resource conservation and cost savings. In practical applications, this formula can be invaluable for evaluating the effectiveness of energy sources, reducing waste, and improving overall performance of systems.