Final answer:
Relays operate by using an electromagnet to manipulate a switch, allowing them to control high-power circuits with a low-power signal. They are crucial in supporting small motors and solenoids, providing the necessary current and protection from excessive current.
Step-by-step explanation:
How Relays Work
Relays are switches that open and close circuits electromechanically or electronically. Their function is based on the use of an electromagnet to mechanically manipulate a switch. When an electric current passes through the coil, it creates a magnetic field that activates a switch, thereby closing or opening the connection. This allows relays to control a high-power circuit with a low-power signal, making them essential in enabling small motors and solenoids to operate effectively.
Relays Supporting Small Motors and Solenoids
Relays are pivotal for the control of small motors and solenoids, as they allow a relatively small electric current to control a much larger current. This is crucial for the safety and functionality of systems that require precise control over their operations. For small motors, relays provide the necessary current to start and run the motor while protecting the control circuit from excessive current. For solenoids, which are essentially coils of wire that become magnetized when electricity flows through them, relays ensure that they receive the correct current to function correctly without overheating or experiencing power overload.