To compare the emf of two given primary cells using a potentiometer | Physics Practical Class 12

 To compare the emf of two given primary cells using a potentiometer.

Aim: -

To compare the emf of two given primary cells using a potentiometer.

APPARATUS: -

A  potentiometer, jockey, two primary cells (Leclanche and Daniel), two way key, galvanometer, battery or battery eliminator, rheostat, one way key, connecting wires.

THEORY: -

If a steady current is mentioned by a battery through a wire of uniform composition and cross sectional area, then the potential drop V along the wire, is directly proportional to its length 'l'

Write formula and describe it.

OBSERVATIONS: -

1.    Number of wires in potentiometer         =    .............

2.    Range of resistance box                         =    ............

3.    Voltage drop error              E                 =    ............

4.    Voltage drop error              E2                =    ............

5.    Voltage drop error              E3                 =    ............

Table: Comparison of emf of two cells

PRECAUTIONS: -

1.    All connections should be neat clean and tight.

2.    The emf of battery E should be greater than E1 and E2.

3.    The current in the circuit should remain constant for a set of observations.

4.    Jockey should be pressed lightly on the wire.