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.

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Solution

The correct option is B
A voltmeter must be connected in parallel and an ammeter in series with resistance in the circuit.

Hence, option (b) is the correct answer.

Why this question ?

Key concept :

Ammeter : It is a device used to measure current and its always connected in series with the ’element’ through which current is to be measured.
Voltmeter : It is a device used to measure potential difference and always put in parallel with the ’circuit element’ across which potential difference is to be measured. Greater the resistance of voltmeter, more accurate will be its reading.

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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.

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.