A voltmeter and an ammeter can be used together to measure resistance and power. The resistance R of a resistor equals the potential difference Vab between its terminals divided by the current I; that is,
R = Vab/I
The power input P to any circuit element is the product of the potential difference across it and the current through it:
P = Vab x I
In principle, the most straightforward way to measure R or P is to measure and I simultaneously.
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