what is Relay ?
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what is Relay ?
من طرف Eghelp الإثنين 10 يونيو 2013, 9:53 pm
what is Relay ?
A relay is a switching device for opining and closing one or more electrical circuits on receipt of an electrical signal.
A simple kind of of relay consists of two parts :
a switch in a high voltage circuit witch is operated by a spring loaded armature and low voltage electro-magnetic circuit .
The electro-magnetic comprises a soft iron core shaped like horseshoe.
Each arm of the core has a coil wound around it.
The coils are connected to each other and to a battery through an on/off switch.
when the switch is closed , the electro-magnet is energized and the armature is attracted towards it.
This closes the contacts and enables the current to flow through the high voltage circuit .
When the switch is opened a spring pulls the armature away from the magnet, and contacts open again.
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