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Answer Posted / ashwin
Yes we can control the speed of fan by varying the voltage. Voltage varies in series connection of resistance. In olden days they use to connect resistors in series and when we turn the regulator knob, we can add more resistance or remove resistance in series thereby reducing or increasing the voltage input to the fan. Nowadays instead of using external resistors they are using metal's or material's internal resistance. (I don't know about the disc material. It will be somewhat like a metal alloy.) A roller or ball will move over a metal disc. The position of the ball on the disc will determine the total resistance included in series(this is because of the internal resistance of the metal). They are using this technique in smooth regulators.
Correct me if I am wrong.
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