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To verify the laws of combination (series & parallel) of resistances using meter bridge (slide Wire Bridge)
A meter bridge, laclanche cell, a galvanometer, a resistance box, a jockey, two resistances wires, set square, sand paper and connecting wires.
Observations: Table for length (ι) & unknown resistance (r):
Calculations:.
In Series: Experimental value of R S = 2.72Ω
Theoretical value of R S =r 1 + r 2 = 2.75Ω
In parallel: Experimental value of R P =0.66Ω
Theoretical value of R P =r 1 r 2 /r 1 + r 2 = 0.68Ω
Result: Within limits of experimental error, experimental & theoretical values of R S are same. Hence the law of resistance in series i.e. R s = r 1 + r 2 is verified. (1) Within limits of experimental error, experimental & theoretical values of R p are same. Hence law of resistances in parallel i.e. R s = r 1 r 2 /r 1 +r 2 is verified.
Precautions:
- The connections should be neat, clean & tight.
- Move the jockey gently over the wire & don’t rub it.
- All plugs in resistant box should be tight.
Sources of Error:
- The plugs may not be clean.
- The instrument screws maybe loose.
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Related categories.
- Class 12 Physics
- Engineering Physics
- Class 11 Physics
- Physics Knowledge Base
- Physics Class 10
Class 12 Physics Lab Experiment list
- 1 To find resistance of a given wire using Whetstone’s bridge (meter bridge)
- 2 To find the focal length of a convex mirror using a convex lens
- 3 To find the value of ‘v’ for different values of ‘u’ in case of a concave mirror & to find its focal length
- 4 To draw the characteristics curves of a zener diode vs to determine its reverse breakdown voltage
- 5 To determine the refractive index of a glass using travelling microscope
- 6 To convert the given galvanometer (of known resistance & figure of merit) into an ammeter of desired range & to verify the same
- 7 To determine angle of minimum deviation for a given prism
Laboratory Experiment Categories
- Electrical and Electronics
- Civil Engineering
- Engineering Mechanics
- Mechanical Engineering
- Biomedical Engineering
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