Single pole relay:
The relay has 5 terminals,
1.Normally open(NO) contact
2.Normally closed(NC) contact
3.common contact
4.Terminal A of the coil
5.Terminal B of the coil
Practical Representation:
The Terminals A and B of the coil are excited by a 5V battery. so the coil gets excited and thus attracts the pole ,so the pole moves from NC to NO contact . Now the supply given to the common terminal starts flowing through the NO contact. so the load connected to that terminal starts working.
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