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Assertion (A): Potentiometer measures the potential difference more accurately than a voltmeter.
Reason (R): There is no current drawn from external circuit in potentiometer.
Reason (R): There is no current drawn from external circuit in potentiometer.
- a)Both Assertion (A) and Reason (R) are true, and Reason(R) is the correct explanation of (A).
- b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- c)Assertion (A) is true, but Reason (R) is false.
- d)Assertion (A) is false, but Reason (R) is true.
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Assertion (A): Potentiometer measures the potential difference more ac...
When a potential difference is measured using a voltmeter, voltmeter draws some current and when it is connected across the cell, there is a internal potential drop due to the internal resistance of the cell. Hence, measuring potential will not be accurate. In potentiometer, there is no current drawn from external circuit.
Therefore, both assertion and reason are correct and reason is also the correct explanation of A.
Therefore, both assertion and reason are correct and reason is also the correct explanation of A.
Most Upvoted Answer
Assertion (A): Potentiometer measures the potential difference more ac...
Assertion (A): Potentiometer measures the potential difference more accurately than a voltmeter.
Reason (R): There is no current drawn from the external circuit in the potentiometer.
The correct answer is option 'A' - Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
Explanation:
Potentiometer:
A potentiometer is an instrument used to measure the potential difference between two points in a circuit. It consists of a long uniform resistance wire, known as the potentiometer wire, and a sliding contact called the jockey. The potentiometer wire is connected in series with a battery, while the jockey is used to make contact with the wire.
Voltmeter:
A voltmeter is a measuring instrument used to measure the potential difference (voltage) between two points in an electrical circuit. It is connected in parallel with the component or section of the circuit whose voltage is to be measured.
Accuracy of measurement:
In terms of accuracy, the potentiometer is more accurate than a voltmeter. This is because a potentiometer can measure the potential difference without any current flowing through it, whereas a voltmeter draws a small amount of current from the circuit being measured.
Reasoning:
The reason for the potentiometer's higher accuracy is that it does not draw any current from the external circuit. When a voltmeter is connected in parallel to the circuit, it creates a parallel branch that draws a small amount of current. This current can alter the potential difference being measured, leading to inaccuracies in the voltmeter reading.
On the other hand, a potentiometer does not draw any current from the circuit being measured. The potential difference is measured by adjusting the position of the sliding contact (jockey) along the potentiometer wire until the galvanometer shows zero deflection. At this point, the potential difference across the two points being measured is equal to the potential difference between the jockey and the battery.
Since no current is drawn from the circuit, the potentiometer provides a more accurate measurement of the potential difference compared to a voltmeter. Therefore, Assertion (A) is true, and Reason (R) correctly explains why the potentiometer is more accurate.
Reason (R): There is no current drawn from the external circuit in the potentiometer.
The correct answer is option 'A' - Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
Explanation:
Potentiometer:
A potentiometer is an instrument used to measure the potential difference between two points in a circuit. It consists of a long uniform resistance wire, known as the potentiometer wire, and a sliding contact called the jockey. The potentiometer wire is connected in series with a battery, while the jockey is used to make contact with the wire.
Voltmeter:
A voltmeter is a measuring instrument used to measure the potential difference (voltage) between two points in an electrical circuit. It is connected in parallel with the component or section of the circuit whose voltage is to be measured.
Accuracy of measurement:
In terms of accuracy, the potentiometer is more accurate than a voltmeter. This is because a potentiometer can measure the potential difference without any current flowing through it, whereas a voltmeter draws a small amount of current from the circuit being measured.
Reasoning:
The reason for the potentiometer's higher accuracy is that it does not draw any current from the external circuit. When a voltmeter is connected in parallel to the circuit, it creates a parallel branch that draws a small amount of current. This current can alter the potential difference being measured, leading to inaccuracies in the voltmeter reading.
On the other hand, a potentiometer does not draw any current from the circuit being measured. The potential difference is measured by adjusting the position of the sliding contact (jockey) along the potentiometer wire until the galvanometer shows zero deflection. At this point, the potential difference across the two points being measured is equal to the potential difference between the jockey and the battery.
Since no current is drawn from the circuit, the potentiometer provides a more accurate measurement of the potential difference compared to a voltmeter. Therefore, Assertion (A) is true, and Reason (R) correctly explains why the potentiometer is more accurate.
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Assertion (A): Potentiometer measures the potential difference more accurately than a voltmeter.Reason (R): There is no current drawn from external circuit in potentiometer.a)Both Assertion (A) and Reason (R) are true, and Reason(R) is the correct explanation of (A).b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).c)Assertion (A) is true, but Reason (R) is false.d)Assertion (A) is false, but Reason (R) is true.Correct answer is option 'A'. Can you explain this answer?
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Assertion (A): Potentiometer measures the potential difference more accurately than a voltmeter.Reason (R): There is no current drawn from external circuit in potentiometer.a)Both Assertion (A) and Reason (R) are true, and Reason(R) is the correct explanation of (A).b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).c)Assertion (A) is true, but Reason (R) is false.d)Assertion (A) is false, but Reason (R) is true.Correct answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Assertion (A): Potentiometer measures the potential difference more accurately than a voltmeter.Reason (R): There is no current drawn from external circuit in potentiometer.a)Both Assertion (A) and Reason (R) are true, and Reason(R) is the correct explanation of (A).b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).c)Assertion (A) is true, but Reason (R) is false.d)Assertion (A) is false, but Reason (R) is true.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): Potentiometer measures the potential difference more accurately than a voltmeter.Reason (R): There is no current drawn from external circuit in potentiometer.a)Both Assertion (A) and Reason (R) are true, and Reason(R) is the correct explanation of (A).b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).c)Assertion (A) is true, but Reason (R) is false.d)Assertion (A) is false, but Reason (R) is true.Correct answer is option 'A'. Can you explain this answer?.
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