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Trying to prove a point

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CoopedUp:
And of course I picked D because it applyable to most switches. Another question asks
A(n)______ converts light energy directly into electric energy

A. phototransistor
B. solar cell
C. photoconductive cell
D. LED

I wrote on the test that I'm sure all of them produce electricity when light is shown on them but I can personally vouch that b and d are correct. And his response was LEDs don't produce electricity when a light is on it... But they do and he's and electrical engineer... And he refuses to give me point because God forbid he's wrong

L_Euler:
He didn’t happen to explain what happens to the switch when power is applied did he?

CoopedUp:
His only explanation had something to do with a home switch in a cnc but it wasn't correct

Gregg:
For a relay, C is a subset of D.  If power applied means to the relay coil; the question does not state this. A rational person reading the question does not know what is meant by “power applied”; therefore choice D is far more rational and correct for more switching situations.

For a manual switch, choice C doesn’t make any sense when considered as an answer to the stated question.  However, D makes more sense than C but the question is very vague and flawed.

The question should be:
The abbreviation NO (normally open) represents the electrical state of:
OR
The abbreviation NC (normally closed) represents the electrical state of:

The teacher is trying to combine two questions into one; without a suitable answer. 

Those who can — do
Those who can’t – teach
Those who can’t even teach – can have a career in management or marketing

ejeffrey:

--- Quote from: CoopedUp on June 07, 2019, 03:16:06 am ---And of course I picked D because it applyable to most switches. Another question asks
A(n)______ converts light energy directly into electric energy

A. phototransistor
B. solar cell
C. photoconductive cell
D. LED

I wrote on the test that I'm sure all of them produce electricity when light is shown on them but I can personally vouch that b and d are correct. And his response was LEDs don't produce electricity when a light is on it... But they do and he's and electrical engineer... And he refuses to give me point because God forbid he's wrong

--- End quote ---

OK, on that one you are just being a pain in the ass.  The answer is clearly B, and saying anything else is stupid even if in some situations the other devices can do it.  That is why most multiple choice exams state "circle the best answer" or similar at the top.  The best answer to that question is B, and I would absolutely not give you a point for any other answer.

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