Web Reference: Explore the fundamentals of relays, their types, components, and real-world applications in electrical engineering. A relay consists of an electromagnet and a mechanical switch. An electromagnetis a simple device made up of a wire wound in a coil around a core of ferromagnetic material such as iron. This is a very interesting device and it is easy to build one yourself. All you need is an iron nail and some insulated wire. Wind the wire into a coil around the na... How relays work. In this video we look at how relays work, what are relays used for, different types of relay, double pole, single pole, phototransistor, solid state relay,...
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