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The full circuit voltage
voltage is measured by voltagd drops. When a switch is open/ off there is a voltage difference between one side to the other. when the switch is on there is no drop from one side of the switch to the other. That is normal operation. If switch is on, and you get a voltage reading across the switch, the switch is bad.
Probably not, since a volume control switch is designed for extremely low current measured in fractions of a watt, while a dimmer switch is typically capable of handling several hundred watts.
Power is measured in watts.
Inductance is measured in henrys.