It touches two conductors together to allow current to flow from one to the other. Essentially, the relay allows one device to effortlessly control a much larger device.Īs you already know, if you touch two pieces of wire together and if the terminals of a power source are connected to the wires, current would flow from one wire to the other. The mechanical effort it takes to turn the ignition key is nothing compared to the effort it would take to start it with a pull rope. It's sort of like when you start a car engine.
For those of you who are just starting out, just remember that, generally, they allow a very small current to control a high current circuit. Since you generally can't see what's going on inside the relay, it can be difficult to understand how they operate. Looking at them from the outside, they are little sealed boxes with multiple terminals. Initially, relays are confusing to those new to electronics.
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