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Why is using an ammeter and voltmeter to measure resistance, better than using just an ohmmeter, or a multimeter. i know it increases the significant figures, but why???

I have done a piece of course work for physics, which is titled how does length affect the resistance of wire? i have done the aim, method, collection of data, conclusion etc now i need to do the evaluation, i have already commented on how i collected data safely, and the limitations. i have...