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Electronics Fundamentals/Electromagnetic Devices/Relay
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Relay
Relay is an Electromagnetic switch . It operates on the principle of Electromagnetic Force that creates from a current conducting coil that push or pull the switch contacts to open or close the circuit.Relay is used in many applications like as vehicle indicator etc.
Construction
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Relay Types
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Reference
Relay