Write the working formula (Derivation not required). Draw a circuit diagram used to compare the e.m.f. Apparatus A potentiometer, a battery (or battery eliminator), two one-way keys, a rheostat of low resistance, a galvanometer, a high resistance box, a fractional resistance box, an ammeter, a voltmeter, a […] The potentiometer is the electrical type of transducer or sensor and it is of resistive type because it works on the principle of change of resistance of the wire with its length. Potentiometric titrations provide more reliable data than data from titrations that … To state the principle of potentiometer, it can be noted that when a constant current passes through a wire that is of uniform cross section, the potential difference between the 2 points or ends is directly proportional to the length of the wire between the 2 ends. What is the principle of a potentiometer? It can be explained as below. Explain how the balance point shifts when value of resistor R increases in the circuit of potentiometer, given below. Current Affairs Quiz November 2020 – Attempt Quiz to Strengthen your Exam Prep! In this capacity, it is functioning as a null instrument; it permits precision measurement by adjusting a value of a circuit element until a meter reads zero. The potentiometer can work as a rheostat (variable resistor) or as a voltage divider. Its accuracy depends on uniformity of the wire. field