Recall and apply both efficiency equations.

Efficiency is a measure of how well energy is converted from one form to another, indicating the proportion of useful energy output compared to the total energy input. There are two main equations for calculating efficiency: one uses useful energy output divided by total energy input, while the other uses useful power output divided by total power input. Understanding and applying these equations allows us to assess the performance of devices and processes, highlighting areas for improvement and the importance of minimizing wasted energy to enhance overall efficiency.