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This is kind of a stupid question, but in circuitry, what role does a coil take? What does it do?
Please explain.Depends on what kind of coil there are many.
Toroid: They will amplify voltage.
A toroid may or may not produce a voltage higher than the supply - just like any other coil may or may not produce a voltage higher than the supply.How will a toroidal coil amplifier rhe voltage any more than any other kind of coil?
A toroid may or may not produce a voltage higher than the supply - just like any other coil may or may not produce a voltage higher than the supply.
But in general a toroid is wound on a metallic core that has a higher permeability than air and if the supply (voltage) is turned off abruptly, the magnetic energy contained in the core will collapse quickly and produce a voltage of opposite polarity to the energising voltage.