Electronics > Beginners
Trying to prove a point
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Brumby:
From the outset, I've dismissed any answers where "power" is mentioned as a condition.  As a couple of others have said, the state of the switch contacts in their "normal" position is not defined by whether power is, or is not, applied.  It is defined by a physical property when examined in isolation.

The answer is D - but if the teacher has a different one in mind, I'd like to hear their reasoning.
vk6zgo:
NO & NC are by convention, in the unoperated state of the device, & do not depend upon the external circuit.
The other interpretations are misunderstanding at best, & sophistry at worst.
StillTrying:
"The abbreviations NO (normally open) and NC (normally closed) represent the electrical state of switch contacts when
C. power is not applied."

That makes no sense, is 100% wrong, ambiguous, and stupid, if they meant relay they should have said relay and not switch, and even then it should say coil somewhere. The OP should buy the teacher a hat with the correct answer on it.

Just a picture of one of those micro switches above with C, N/O, N/C on it would do. The explanation of where power comes in to it won't make any sense, so keep his new hat ready. :)
tautech:

--- Quote from: StillTrying on June 08, 2019, 06:02:40 am ---C. power is not applied.
Is 100% wrong, ambiguous, and stupid, if they meant relay they should have said relay and not switch, the OP should buy the teacher a hat with the correct answer on it.

--- End quote ---
This^^^
Teachers like to think they know everything and therefore occasionally need to be reset to show they are not infallible and in fact human and mistake prone like anyone else !
These are good examples of poor teaching skills and appropriate to take to the head of department for their correction of the syllabus.
Mechatrommer:

--- Quote from: tautech on June 08, 2019, 07:54:49 am ---
--- Quote from: StillTrying on June 08, 2019, 06:02:40 am ---C. power is not applied.
Is 100% wrong, ambiguous, and stupid, if they meant relay they should have said relay and not switch, the OP should buy the teacher a hat with the correct answer on it.

--- End quote ---
This^^^
Teachers like to think they know everything and therefore occasionally need to be reset to show they are not infallible and in fact human and mistake prone like anyone else !
These are good examples of poor teaching skills and appropriate to take to the head of department for their correction of the syllabus.

--- End quote ---
teaching skill is different from making question skill. syllabus is another thing made by another body. good teacher will encourage students to learn and accepts mistake incase student or anybody else highlight it. its more personal matter. i was lucky to get into some program to allow "non-education specialized course graduate" to enter education sector. i saw many of these "education specialized course" young teachers lack practical implementation of the syllabus they taught. but many from them are quite tolerant. stubborn teacher is quite rare though, its something they are taught in college? or just personal matter i dont know, but i believe its personal matter. i wish from time to time they will allow again "non-education specialized" such as from engineering, doctor, accountant degree course to become teacher so various discipline can share thoughts for better education.


--- Quote from: StillTrying on June 08, 2019, 06:02:40 am ---if they meant relay they should have said relay and not switch, the OP should buy the teacher a hat with the correct answer on it.

--- End quote ---
so it mustn't be a transistor? he should call it an "electromagnetic coil actuated switch" not a relay, because relay means...
https://dictionary.cambridge.org/dictionary/english/relay
you cant apply power to nor "actuate" a group of people, its illegal.. well literalism hat off...
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