Wheatstone bridge Practical

Wheatstone bridge Practical
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1 Answer

Answer :

Practical Significance

The conductors are generally made from copper & aluminum. They are having low resistance. It is essential to measure its resistance precisely to calculate the voltage drop per kilometer when these conductors are used in transmission and distribution circuits.


Competency and Practical Skills

This practical is expected to develop the following skills for the industry identified competency: ‘Plan wiring/cabling activities using relevant materials following safe practices’

1. Measure electrical parameters using proper equipment.


Practical Outcome

1. Use the Wheatstone’s bridge to measure resistance of a conductor bundle (to determine per unit length resistance).

2. Use Wheatstone’s bridge to measure resistance of conductor bundles (to determine per unit length resistance) (two specimens of different cross sections area).


Relevant Affective domain related Outcome(s)

1. Practice good housekeeping with safety measures.

2. Demonstrate working as a leader/a team member.

3. Maintain tools and equipment.

4. Follow ethical practices.


Minimum Theoretical Background

A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of abridge circuit, one leg of which includes the unknown component. The Wheatstone bridge provide extremely accurate measurements. Its operation is similar to the original potentiometer.


The Wheatstone bridge circuit is shown in Fig. 2. The resistances P, Q are known resistances and resistance S is adjustable. If the voltage across galvanometer is zero, then, P/Q = R/S.

Therefore, the unknown resistance R = P/Q x S


Practical set-up / Circuit diagram / Work Situation

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Resources Required

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Precautions to be followed

1 Read manufactures instruction before using kit.

2 Follow instructions mentioned in the instruction sheet.

3 There should not be any loose connections.


Procedure

1. Connect test wire coil to terminals.

2. Set Wheatstone bridge for reading by pressing the push buttons on the panel and obtain the balance by varying the dials.

3. Note down the readings in observation Table.

4. Repeat the experiment for 2/3 samples.

5. Calculate the total resistance (R) of the coil.

6. Determine per unit length resistance

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