The following is how to test circuit breakers and ground fault interrupters (GFI) to ensure they are providing the proper protection:

Circuit breakers are found the the metal electrical box typically found in a basement or closet (see the above picture on the right). You can test circuit breakers by switching from the "on" to the "off" position, and back again. If you have any questions about how to do this, then you should contact a professional.

Ground fault interrupters (GFI) outlets are typically found where you have water near electrical outlets, for example in kitchens and bathrooms.

You check the operation of all ground-fault circuit interrupter outlets by pushing the "test" button. The "reset" button should pop out, indicating the receptacle is operating properly. Press in the reset button when finished.