First, turn off lamps and appliances in use when the circuit goes out.
Make sure your hands are dry and you are standing on a dry surface. Identify the breaker switch that is in (or toward) the "off" position. Turn it all the way to "off" and then to the "on" position.
If the breaker tripped because there is something wrong with an appliance, be sure to have the necessary repairs made before using the appliance again.
APS owns, and is responsible for electrical wiring up to and including your meter. You are responsible for the wiring beginning with your circuit breaker panel and continuing throughout your home. If wiring repairs are needed within your home, we recommend calling a licensed electrician.