Question 690: Current Electricity

Question

The potentiometer is best  for measuring voltage, as

Accepted Answer

When we measure the emf of a cell by the potentiometer then no current draws in the circuit in zero-deflection condition i.e., cell is in open circuit. Thus, in this condition the actual value of a cell is found. In this way potentiometer is equivalent to an ideal voltmeter of infinite resistance.
Note:
The emf by the potentiometer is measured from null method in which zero deflection position is found on the wire.

Answer

it has a sensitive galvanometer and gives null deflection

Answer

it has wire of high resistance

Answer

it measures p.d. in closed circuit

Answer

it measures p.d in open circuit.

Current Electricity

The potentiometer is best for measuring voltage, as

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