Question

1. The high resistance R1 in the circuit is used to
A) keep the balance point near the midpoint of the potentiometer wire AC.

B) reduce the current supplied by the battery (B) to zero at balance point.

C) the galvanometer from damage due to large current

D) make the galvanometer more sensitive.

Answer 1

The high resistance R1 in the circuit is used to:

B) Reduce the current supplied by the battery (B) to zero at the balance point.

• The potentiometer is a resistor of a three-terminal that makes a voltage driver which in turn acts as a variable resistor. It is used to measure the electric potential across a circuit.
• The high resistance is needed to reduce the current because the galvanometer is highly sensitive and for high current, it can be damaged.