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The accuracy of Kelvin's double bridge for the measurement of low resistance is high because the bridge
- a)uses two pairs of resistance arms
- b)has medium value resistance in the ratio arms
- c)uses a low resistance link between standard and test resistances
- d)uses a null indicating galvanometer
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
The accuracy of Kelvin's double bridge for the measurement of low ...
(a)
Kelvin Bridge overcomes the difficulties that arise in a Wheatstone bridge on account of the resistance of the leads and the contact resistances while measuring low valued resistors. The Kelvin double bridge incorporates the idea of a second set of ratio arms, hence the name double bridge and the use of four terminal resistors for the low resistance arms. The second set of ratio arms eliminates the effect of connecting lead resistance.
Kelvin Bridge overcomes the difficulties that arise in a Wheatstone bridge on account of the resistance of the leads and the contact resistances while measuring low valued resistors. The Kelvin double bridge incorporates the idea of a second set of ratio arms, hence the name double bridge and the use of four terminal resistors for the low resistance arms. The second set of ratio arms eliminates the effect of connecting lead resistance.
Most Upvoted Answer
The accuracy of Kelvin's double bridge for the measurement of low ...
Kelvin's Double Bridge is a popular method used for accurately measuring low resistance. It has the following features:
Features:
- Uses two pairs of resistance arms
- Has medium value resistance in the ratio arms
- Uses a low resistance link between standard and test resistances
- Uses a null indicating galvanometer
Explanation:
- The use of two pairs of resistance arms ensures that the bridge is balanced and the resistance measurements are accurate.
- The medium value resistance in the ratio arms helps to reduce errors due to stray capacitance and inductance.
- The low resistance link between the standard and test resistances ensures that the current flowing through the bridge is not affected by the resistance of the link itself.
- The null indicating galvanometer helps to accurately measure the difference in potential between the two arms of the bridge.
Overall, the combination of these features makes Kelvin's Double Bridge an accurate and reliable method for measuring low resistance.
Features:
- Uses two pairs of resistance arms
- Has medium value resistance in the ratio arms
- Uses a low resistance link between standard and test resistances
- Uses a null indicating galvanometer
Explanation:
- The use of two pairs of resistance arms ensures that the bridge is balanced and the resistance measurements are accurate.
- The medium value resistance in the ratio arms helps to reduce errors due to stray capacitance and inductance.
- The low resistance link between the standard and test resistances ensures that the current flowing through the bridge is not affected by the resistance of the link itself.
- The null indicating galvanometer helps to accurately measure the difference in potential between the two arms of the bridge.
Overall, the combination of these features makes Kelvin's Double Bridge an accurate and reliable method for measuring low resistance.
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The accuracy of Kelvin's double bridge for the measurement of low ...
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The accuracy of Kelvin's double bridge for the measurement of low resistance is high because the bridgea)uses two pairs of resistance armsb)has medium value resistance in the ratio armsc)uses a low resistance link between standard and test resistancesd)uses a null indicating galvanometerCorrect answer is option 'A'. Can you explain this answer?
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