Electronics > Beginners
Trying to prove a point
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DDunfield:
The question says switch, as do two of the possible answers, so I would say 'D'.
Worth noting that 'D' covers off a relay as well.

One could argue that if you keep your computer on almost all the time, then it's switch is "normally" closed, however by convention the term "normally" applied to an electrical switch indicates it's position in a deactivated position.

Light switch - deactivated is open, so it's "normally open".

Reed sensor in a intrusion alarm, deactivated means loop not broken (closed), so it's "normally closed".

Dave

PS: What did the teacher say was the correct answer?
neil t:
If no diagram of the switch unit is supplied your teacher has asked a stupidly vague question, all the multiple answers are possible dependant on the type of unit.
JxR:
You didn't say what your answer was.  How can we tell you if your wrong or right?  Like everyone else said, the answer is D.

This shows alot of pictures, while I only scanned it nothing immediately wrong stood out.  Maybe it will help if your answer was not D.

https://www.electronicshub.org/switches/
DDunfield:
Also worth mentioning that it's fairly unusual to see N.O and N.C. applied to switches which have two steady-states (toggle), since these can be used in either capacity. If it does appear it will be describing the switch function in the circuit, not the physical switch itself.

The nomenclature is usually applied to switches which must be held in the active state, such as momentary push buttons, spring levers and relays.

Dave
CoopedUp:
 :blah: he says the only correct answer is c and refuses to accept that he is wrong, and let me tell you it's not the only question he made that had several correct answers... He's such a stubborn guy... I like him as a person just not as a teacher
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