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.
The first electronic device ever invented is the relay, a remote switch controlled by electricity that was invented in 1835 by Joseph Henry, an American scientist, although it is also claimed that the English inventor Edward Davy certainly invented the electric relay in his electric telegraph c.1835.