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photo a gate can keep you out or let you into a field in the same way a microscopic logic gate is a barrier in an electronic circuit that can let electricity through or stop it flowing altogether put lots of logic gates together and you make a machine that s capable of basic mathematical reasoning
How relays work. Here are two simple animations illustrating how relays use one circuit to switch on a second circuit. When power flows through the first circuit (1), it activates the electromagnet (brown), generating a magnetic field (blue) that attracts a contact (red) and activates the second circuit (2).ther relays are normally closed (NC; the contacts are connected so a current flows through them by default) and switch off only when the magnet is activated, pulling or pushing the contacts apart. Normally open relays are the most common. Here's another animation showing how a relay links two circuits together.