Which of the following wiring diagrams could be used to experimentally determine R using ohm's law ? Assume an ideal voltmeter and an ideal ammeter.

Ohm's law states that the current through the conductor between two points is directly proportional to the potential difference across the two points.

For proper measurement of voltage and current, Voltmeter is connected in parallel and Ammeter is connected is series.

In circuit diagram B, all the current flows through R can be measured with ammeter A and the Potential difference across R can be measured by the voltmeter V.