Welcome To Albany, New York. Albany enjoys a vibrant downtown, a rich mixture of historical neighborhoods, and an exciting variety of arts, cultural and entertainment opportunities. Albany serves as the capital of New York State and it has a population of approximately 100,000.
A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal.
In general, the point of a relay is to use a small amount of power in the electromagnet -- coming, say, from a small dashboard switch or a low-power electronic circuit -- to move an armature that is able to switch a much larger amount of power.