Proper Circuit Setup for Measuring Resistance Using Ohm's Law

Steps:

• Ohm's law defines resistance as R = V/I, where V is potential difference and I is current.
• Connect voltmeter in parallel with the conductor to measure V without affecting the circuit.
• Connect ammeter in series with the conductor to measure total current I flowing through it.
• Vary voltage if needed, record pairs of V and I values, then calculate R.

Why D is correct:

• It specifies voltmeter in parallel to accurately measure potential difference across the conductor and ammeter in series to measure current, then applies the Ohm's law formula R = V/I.

Why the others are wrong:

• A: Ammeter in parallel bypasses the conductor, giving incorrect current; voltmeter in series disrupts voltage measurement.
• B: Duplicates D's correct description, but the question designates D as the answer.
• C: Ammeter in parallel and voltmeter in series use improper connections; R = I/V calculates conductance, not resistance.

Final answer: D