Potentiometer is the instrument working on the principle of:

Explanation

Wheatstone Bridge: The Wheatstone bridge is a circuit arrangement consisting of four resistive elements connected in a diamond shape. It operates based on the principle of null detection, where the bridge is balanced by adjusting one of the resistances until the potential difference across the central point of the bridge is zero. The potentiometer uses the Wheatstone bridge principle to measure unknown voltages or to compare and calibrate resistances. In conclusion, the potentiometer is an instrument that works based on the principle of the Wheatstone bridge, which involves the balancing of resistances to measure unknown voltages or compare resistances accurately.