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relay |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.01 sec. |
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relay, electromechanical switch switch, electrical device having two states: on, or closed; and off, or open. Ideally a switch offers a zero impedance to a current when it is closed, and it offers infinite impedance when open. ..... Click the link for more information. operated by a flow of electricity in one circuit and controlling the flow of electricity in another circuit. A relay consists basically of an electromagnet with a soft iron bar, called an armature, held close to it. A movable contact is connected to the armature in such a way that the contact is held in its normal position by a spring. When the electromagnet is energized, it exerts a force on the armature that overcomes the pull of the spring and moves the contact so as to either complete or break a circuit. When the electromagnet is de-energized, the contact returns to its original position. Variations on this mechanism are possible: some relays have multiple contacts; some are encapsulated; some have built-in circuits that delay contact closure after actuation; some, as in early telephone circuits, advance through a series of positions step by step as they are energized and de-energized. An electrical switch that allows a low power to control a higher one. A small current energizes the relay, which closes a gate, allowing a large current to flow through. |
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? Mentioned in | ? References in periodicals archive | |
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Packed with intriguing characters, vivid visual imagery, an exciting and suspenseful plot, morality issues relayed in a sensitive and subtle manner, and brilliant illustrations, THE TOONIES INVADE SILICON VALLEY is one book this reader thoroughly enjoyed and would love to see in libraries and homes throughout the country. This is all relayed in a tragic-comic voice, with wonderful metaphors tumbling out of Cassie's mind. He recently relayed an account of his first skateboard purchase some 10 years ago at a shop in San Jose. |
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