Check out a “Kill A Watt” meter. The library has 4 meters that can be checked out with just your library card.
What is a “Kill A Watt” meter?
This device will measure how much electricity your electrical home devices are using. Use them to come up with a plan to save energy, or just to see how much energy a device is using. These can not be used on 220, only 110 wired devices.