Enter the supply input power (watts) and the unit output power (watts) into the calculator to determine the Power Supply Efficiency.
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Power Supply Efficiency Formula
The following formula is used to calculate the Power Supply Efficiency.
Eps = (OP / IP) * 100
- Where Eps is the Power Supply Efficiency (%)
- OP is the unit output power (watts)
- IP is the supply input power (watts)
To calculate the power supply efficiency, divide the unit output power by the supply input power. In real power supplies, the efficiency is typically less than 100%.
How to Calculate Power Supply Efficiency?
The following two example problems outline how to calculate the Power Supply Efficiency.
Example Problem #1:
- First, determine the supply input power (watts). In this example, the supply input power (watts) is given as 100.
- Next, determine the unit output power (watts). For this problem, the unit output power (watts) is given as 60.
- Finally, calculate the Power Supply Efficiency using the equation above:
Eps = (OP / IP) * 100
Inserting the values from above and solving the equation:
Eps = 60 / 100 * 100 = 60 (%)
Example Problem #2:
Using the same process as above, first define the variables required by the formula. In this case, these values are:
supply input power (watts) = 200
unit output power (watts) = 50
Entering these values yields:
Eps = 50 / 200 * 100 = 25 (%)
