Question

Potentiometer measures potential more accurate because

1)it uses sensitive galvanometer for null deflection

2)it uses high resistance potentiometer wire

3)It measures the ppotential in the closed circuit

4)it measures the potential in the open circuit

Answer 1

A potentiometer has very large resistance. To read load voltage or voltage across any circuit element, potentiometer is connected parallely across it. Thus, the load voltage or circuit voltage gets applied across the potentiometer but as the resistance is very high compared to load resistance, you can safely assume their is almost no current flowing through potentiometer. As power=VI, the power loss in potentiometer is almost equal to zero as current through it remains zero.
Therefore the correct option is (4) it measures the potential in the open circuit.

Answer 2

Answer:

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• A potentiometer has very large resistance. To read load voltage or voltage across any circuit element, potentiometer is connected parallely across it. Thus, the load voltage or circuit voltage gets applied across the potentiometer but as the resistance is very high compared to load resistance, you can safely assume their is almost no current flowing through potentiometer. As power=VI, the power loss in potentiometer is almost equal to zero as current through it remains zero.
• Therefore the correct option is

(4) it measures the potential in the open circuit.