\[\eta = \frac{P_{out}}{P_{in}}\]
Variables
etamechanical efficiency
Poutoutput power (W)
Pininput power (W)
Description
What is this formula?
The mechanical efficiency equation calculates the ratio between useful output power and total input power in a mechanical system.
When to use it
Use this formula when evaluating engines, motors, turbines, pumps, transmission systems, or any device that converts energy.
Example
A motor receives 5000 W of input power and delivers 4200 W of useful output power.
Data:
Pin = 5000 W
Pout = 4200 W
Formula:
eta = Pout/Pin
Substitution:
eta = 4200/5000
Result:
eta = 0.84
Applications
Mechanical engineering, energy systems, industrial machinery, automotive systems, turbine analysis, and efficiency optimization.