I was asked a question by a student today and I have been pondering about it for a while now. In an experiment to measure resistance of a conductor, should we vary voltage across the conductor and measure the current or should we vary current flowing in the conductor and measure voltage across it?
Experimentally, which would give us better results?
I've been thinking that in either case the drop across the ammeter or voltmeter should be very little (and almost of the same order). So would it make any difference?