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Goku1814
By Goku1814
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I'm not sure how it's wired internally, but (glossing over complications) an electric motor is also a generator.

Basically, for certain types of electric motors, when you supply electricity to them they spin, and when you spin them, they supply electricity. 

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Just now, Goku1814 said:

https://youtu.be/MS0vMJrCuAc

Can anyone explain this??

The motor in the fan generated power.

Highly likely the LED normally runs off that line of power too, so that is why it turned on.

 

Look up 'dynamo physics'.

Extremely common piece of equipment used on bicycles for this exact purpose; turns you cycling > rotating the wheel > rotating a piece of the dynamo > into power for your light.

Nowadays these dynamos are built into the bikes, but in the past there was something physically on the bike wheel that spun around:

image.png.f3b578868bad0f792a17ab35e6c3870a.png

 

Anyways, this is why it is not recommended to start blow air into your fans when cleaning them; especially so when they are still plugged in. You could be introducing power into the circuit the wrong way around.

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Don't DO THAT spinning your fans like that Decreases the life span of them dramatically!! pretty soon ur gonna see that blue smoke. and some pc fans save power by using the friction they create as static electricity. so when u spin them like that they think there on and use that energy generated by the friction to make electricity to power the lights without needing a separate led cord. I cant explain it that well sorry

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11 minutes ago, Goku1814 said:

Its not plugged into anything

https://en.wikipedia.org/wiki/Dynamo

 

You are likely de-lubricate your fans by spinning them at much higher speeds than intended, which will make them more noisy and likely to break. Not sure that it will happen for all types of lubrication/fan bearing.

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