To verify the laws of combination of resistances (in series and parallel) using a meter bridge | Physics Practical class 12

 To verify the laws of combination of resistances (in series and parallel) using a meter bridge.

Aim: -

To verify the laws of combination of resistances (in series and parallel) using a meter bridge.

APPARATUS: -

A meter bride, two different resistances, resistance box, one way key, galvanometer, Leclanche cell, connecting wires, sand paper.

THEORY: -

OBSERVATION TABLE 

Make yourself

CALCULATIONS: -

Do Yourself

RESULT: -

Law of combination of resistance is verified.

PRECAUTIONS: -

1.    The connections should be neat, clean and tight. the needs of the connecting wires should be rubbed and cleaned with a sand paper.

2.    The apparatus should be arranged according to the arrangement diagram given in the book and then the connection should be made accordingly.

3.    Plugs in the resistance box should be pressed and made tight by screwing them a little in the clockwise direction.

4.    The key of the battery or the cell should be closed first and then the jockey is touched on wire when the reading is being taken. The jockey key is removed first and then the battery key, immediately after that to minimize the error due to change of resistance by heating.

5.    While moving the jockey to and fro to locate the balance point, the jockey should be lifted again and again and should not be pressed and slided to touch the wore throughout.

6.    While finding out the balance point, the sliding contact should not be pressed too hard, otherwise the uniformity of the wire will be damaged.