EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: random555 on April 02, 2021, 01:44:43 am
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pretty odd question I thought up, but if anyone has one of those old wood clothespegs laying around with the metal spring in them, does that little coil spring have any inductance? I figure as an aircore metal coil it should have something, but I only have a simple mm so I can't test it myself.
thanks
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It will, of course. Literally everything has some inductance. Intentional coil will have more than a straight wire.
There are formulas to calculate all of that.
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https://en.wikipedia.org/wiki/Inductance#Calculating_inductance
You can also look for "air core inductor calculator" on the Internet.
As an order of magnitude estimate, it will be in the few uH range.
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Doesn't the air core inductor calculator assume copper wire? The clothespin spring is some kind of crappy steel.
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They assume lossless conductor, so copper would be closer. But there is a lot of fudge constants there, so it does not matter all that much. Those formulas are only correct for low frequencies, limited dimensions, etc.
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pretty odd question I thought up, but if anyone has one of those old wood clothespegs laying around with the metal spring in them, does that little coil spring have any inductance? I figure as an aircore metal coil it should have something, but I only have a simple mm so I can't test it myself.
thanks
Sure it does. But I think the "coils" are touching (i.e. they aren't made of enamel insulated wire) so the inductance might not be as much as you might get otherwise.