Relays are electrically operated switches that open and close circuits by receiving electrical signals from outside sources. They use electromagnetism to convert small electrical stimuli into larger currents. Relays are highly versatile components that are just as effective in complex circuits as in simple ones. They can be used in the place of other forms of switches, or they can be specifically designed based on factors such as required amperage.

Relays are important because they permit a small amount of electrical current to control high current loads. They can reduce the need for high-amperage wiring and switches, which are expensive and take up space. Relays are used in many applications, including cars systems such as headlights and fuel pumps.

The basic working principle of a relay is that it has a coil of wire that becomes a temporary magnet when electricity flows through it. When a current flows through the coil, it turns it into an electromagnet. The magnet pushes a switch to the left, forcing the spring contacts together, and completing the circuit theyre attached to. Relays can work either as switches (turning things on and off) or as amplifiers (converting small currents into larger ones) .