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ID:1281502
User:81.108.210.94
Article:Relay
Diff:
(link to specific example of the kind of computer alluded to.)
(Tag: possible vandalism)
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{{About|the electrical component}}
 
{{About|the electrical component}}
 
{{Refimprove|date=November 2009}}
 
{{Refimprove|date=November 2009}}
 
 
[[File:Relay.jpg|thumb|right|Automotive-style miniature relay, dust cover is taken off]]
 
[[File:Relay.jpg|thumb|right|Automotive-style miniature relay, dust cover is taken off]]
 
A '''relay''' is an [[electric]]ally operated [[switch]]. Many relays use an [[electromagnet]] to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations.
 
A '''relay''' is an [[electric]]ally operated [[switch]]. Many relays use an [[electromagnet]] to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations.
   
 
A type of relay that can handle the high power required to directly control an electric motor or other loads is called a [[contactor]]. [[Solid-state relay]]s control power circuits with no [[moving parts]], instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called "[[protective relay]]s".
 
A type of relay that can handle the high power required to directly control an electric motor or other loads is called a [[contactor]]. [[Solid-state relay]]s control power circuits with no [[moving parts]], instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called "[[protective relay]]s".
 
  +
your mum saw me last night at the park statement by fuffeylove
 
==Basic design and operation==
 
==Basic design and operation==
 
[[File:Relay Parts.jpg|thumb|right|Simple electromechanical relay.]]
 
[[File:Relay Parts.jpg|thumb|right|Simple electromechanical relay.]]
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