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For the measurement of high resistances following methods are used:
1. Loss of Charge Method
2. Direct Deflection Method
3. Substitution Method
Which of the following is/are correct?
- a)1 and 2
- b)2 and 3
- c)Only 1
- d)1 and 3
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
For the measurement of high resistances following methods are used:1. ...
The Measurement of Resistance according to classification is shown below:
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For the measurement of high resistances following methods are used:1. ...
High Resistance Measurement Methods
In the field of electrical engineering, measuring high resistances accurately is crucial. The methods listed can be categorized based on their principles and applications.
1. Loss of Charge Method
- This method involves charging a capacitor through the high resistance and then measuring the time taken for the capacitor to discharge.
- The discharge rate provides a measure of the resistance, as it is directly related to the resistance value.
- This method is effective for very high resistances, typically in the range of megohms to gigohms.
2. Direct Deflection Method
- This technique uses a galvanometer to measure the current flowing through a high resistance.
- The resistance is determined by observing the deflection of the galvanometer needle.
- Direct deflection methods are commonly used for medium to high resistances but have limitations in precision at extremely high values.
3. Substitution Method
- In this method, a known resistance is substituted for the unknown resistance in a circuit to achieve a balance.
- While it is a valid method for measuring resistance, it is not typically used for very high resistances.
- The substitution method is more suited for lower resistances or when precise calibration is needed.
Conclusion
The correct answer, option 'A', indicates that the Loss of Charge Method and the Direct Deflection Method are appropriate for high resistance measurements. The Substitution Method, while valid, is not primarily designed for high resistances, making it less relevant in this context.
In the field of electrical engineering, measuring high resistances accurately is crucial. The methods listed can be categorized based on their principles and applications.
1. Loss of Charge Method
- This method involves charging a capacitor through the high resistance and then measuring the time taken for the capacitor to discharge.
- The discharge rate provides a measure of the resistance, as it is directly related to the resistance value.
- This method is effective for very high resistances, typically in the range of megohms to gigohms.
2. Direct Deflection Method
- This technique uses a galvanometer to measure the current flowing through a high resistance.
- The resistance is determined by observing the deflection of the galvanometer needle.
- Direct deflection methods are commonly used for medium to high resistances but have limitations in precision at extremely high values.
3. Substitution Method
- In this method, a known resistance is substituted for the unknown resistance in a circuit to achieve a balance.
- While it is a valid method for measuring resistance, it is not typically used for very high resistances.
- The substitution method is more suited for lower resistances or when precise calibration is needed.
Conclusion
The correct answer, option 'A', indicates that the Loss of Charge Method and the Direct Deflection Method are appropriate for high resistance measurements. The Substitution Method, while valid, is not primarily designed for high resistances, making it less relevant in this context.
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