Electrical circuits can be opened or closed using
switches. Switches allow power to flow through lights
and other appliances. There are single switches and
also two way and three way switches. New switches
offer a wide range of control, such as full-range
dimming, a delayed fade from on to off. There are
also switches which turn on when a person is in the
room. Switches should always match the amp and voltage
ratings for the circuit. The most familiar light switch
is single pole switch which has two brass terminal
screws on the side.
