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Last Updated: Nov 12th 2021


Variac's are big windings of wire and the variable part of the output voltage comes from moving a conductive slider along the windings. In doing so, the slider moves through various parts the winding and the output voltage varies. The key here is that variac's use inductance and not resistance in reducing voltage. That is the reason why you can have higher output voltage than the primary voltage on a variac just like a transformer that has the ability to output more voltage than put into it.
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Last Updated: Nov 12th 2021