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Potentiometer measures potential more accurately because

1. it measures potential in the open circuit
2. it uses sensitive galvanometer for null deflection
3. it uses high resistance potentiometer wire
4. it measures potential in the closed circuit

Correct answer: it measures potential in the open circuit

Solution

A potentiometer compares voltages under null condition, so no current is drawn from the source being measured. Because there is no loading effect, the measured potential difference equals the true open-circuit value.

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