Which equation can be used to find the efficiency of a system when horsepower is given?

The formula to calculate the efficiency of a system is defined as the ratio of output power to input power, expressed as a percentage. When horsepower is a given metric, utilizing the relationship of output and input power becomes crucial for understanding how effectively the system converts energy.

In this context, efficiency is calculated with the output power—which is the useful work done—divided by the input power, which is the total energy supplied to the system. By multiplying this ratio by 100%, you get a percentage that represents how well the system performs relative to the energy it consumes.

This approach allows for a clear understanding of system effectiveness, indicating how much of the input power is converted into useful work, therefore aligning with the principles of energy conservation and performance assessment. Other alternatives presented either confuse the relationship between input and output or misrepresent the role of horsepower in calculating efficiency.