How to Check Power Supply Wattage Without Opening

Electronics are seemingly becoming more and more complex as time goes on. With this in mind, it’s important to be aware of just how much power your electronics use. This article will help you figure out how to determine the wattage of your power supply without having to open up the bottom of your computer.

If you need to know the power supply wattage of your computer but don’t want to open up the case, there is a way to find out without having to take any measures. You can use a power supply tester or an online calculator.

how to check power supply wattage without opening

Power supply testers are attachments that you can buy that plug into your power outlet and will let you know the power output of your device. Online calculators like this one will let you input the specifications of your device and will give you the power supply wattage.

What is Power Supply Wattage?

Power Supply Wattage is the amount of power being used by a device or system. This information can be found on the device itself or in the system’s documentation.
Use a power supply tester to check power supply wattage without opening the device. A few models are available for sale online or at hardware stores. Connect the power supply tester to an outlet and turn on the device or system you want to measure. The power supply tester will display the wattage in watts.

How to Check the Power Supply Wattage Without Opening

One of the most common problems with electronics is a low power supply. This can manifest in a number of ways, including reduced performance and even shutdowns. Checking the power supply wattage is a common way to diagnose and troubleshoot these issues. Here’s how to do it:

1) Locate your power supply unit. It’s likely located near the rear of your computer or inside a larger enclosure. If you can’t find it, check the documentation that came with your computer.

2) Plug one end of an AC cord into a wall outlet and the other end into your power supply unit. If your computer is off, it should turn on and show a green light when plugged in. If it doesn’t turn on, try unplugging and plugging in the AC cord again.

3) Use a voltmeter to measure the voltage across the AC cord when plugged in. The voltage should be between 120 volts and 240 volts. If it’s not, there may be an issue with your power supply unit.

4) Please consult the manufacturer’s instructions if you need to open up your power supply unit. If you don’t have those instructions, consult a qualified technician.

5) If your computer is still not working properly after replacing the power supply, try removing one or more of the components in your computer case and plugging them into an outlet to see if that helps.


Sometimes it can be hard to know how much power your device is using without opening it up. This guide will show you how to easily check the power supply wattage on most devices without having to open them up. By following these simple steps, you should be able to determine if there is a need for an upgrade or replacement in your power supply.

You may also like...

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.