Inversion of a logical input can be done with a normally closed contact.
2.
If the normally closed contact were actually an electrical insulator, then it could be used as a relay.
3.
An isolated relay can have more than one pole and can have normally closed contacts as well as normally open contacts.
4.
When a cable is plugged in, the normally closed contacts in the socket are opened so that signals pass through the loop cable.
5.
Change-over ( CO ), or double-throw ( DT ), contacts control two circuits : one normally open contact and one normally closed contact with a common terminal.
6.
This, along with series circuits and more complicated schemes such as multiply wound electromagnets, allows the creation of AND gates, OR gates and Inverters ( using the normally closed contact on a relay ).
7.
Some of these jacks contain a normally closed contact, which can be used to disconnect internal batteries whenever the power supply is connected, avoiding the risk of battery leakage or explosion posed by incorrect recharging of the batteries.
8.
:According to the OED ( 2nd ed . 1989 ), a jack is specifically a socket with one or more pairs of normally closed contacts that open when the plug is inserted, so that the plug becomes part of the circuit ( earliest def . 1891 ).
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