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Potentiometer measures the potential difference more accurately than a voltmeter, because
- a)It draws a heavy current from external circuit.
- b)It does not draw current from external circuit.
- c)it has a wire of low resistance.
- d)it has a wire of high resistance
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Potentiometer measures the potential difference more accurately than a...
Explanation:Potentiometer measures the potential difference using null deflection method, where no current is drawn from the cell; whereas voltmeter needs a small current to show deflection. So, accurate measurement of p.d is done using a potentiometer.
Most Upvoted Answer
Potentiometer measures the potential difference more accurately than a...
Potentiometer is more accurate than voltmeter because it does not draw any current from the circuit containing the unknown battery .the two parts of circuit in potentiometer are independent
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Potentiometer measures the potential difference more accurately than a...
Understanding Potentiometer and Voltmeter
A potentiometer is a device used to measure the potential difference (voltage) across two points in a circuit with high accuracy. Unlike a standard voltmeter, a potentiometer offers several advantages due to its operational characteristics.
Why Potentiometer is More Accurate:
- Minimal Current Draw:
The key distinction lies in the fact that a potentiometer does not draw current from the circuit it is measuring. This is crucial because drawing current can alter the voltage across the component being measured, leading to inaccurate readings.
- High Internal Resistance:
Potentiometers are designed with high internal resistance, which means they do not significantly affect the circuit's operation. This high resistance helps ensure that the potential difference remains unchanged while taking the measurement.
- Comparison Method:
A potentiometer operates on the principle of comparison. It balances the unknown voltage against a known reference voltage, often using a long wire with uniform resistance. This method enhances accuracy as it minimizes errors associated with load effects.
Limitations of Voltmeters:
- Current Draw Issues:
Standard voltmeters typically have lower resistance compared to potentiometers, causing them to draw a certain amount of current from the circuit. This current draw can lead to a voltage drop across the circuit, resulting in inaccurate measurements.
- Effect on Circuit:
Since voltmeters can affect the circuit's operation, they are less reliable for precise measurements, especially in sensitive electronic applications.
In summary, the accuracy of a potentiometer in measuring potential difference stems from its ability to avoid drawing current from the external circuit, making it the preferred choice for precise voltage measurements.
A potentiometer is a device used to measure the potential difference (voltage) across two points in a circuit with high accuracy. Unlike a standard voltmeter, a potentiometer offers several advantages due to its operational characteristics.
Why Potentiometer is More Accurate:
- Minimal Current Draw:
The key distinction lies in the fact that a potentiometer does not draw current from the circuit it is measuring. This is crucial because drawing current can alter the voltage across the component being measured, leading to inaccurate readings.
- High Internal Resistance:
Potentiometers are designed with high internal resistance, which means they do not significantly affect the circuit's operation. This high resistance helps ensure that the potential difference remains unchanged while taking the measurement.
- Comparison Method:
A potentiometer operates on the principle of comparison. It balances the unknown voltage against a known reference voltage, often using a long wire with uniform resistance. This method enhances accuracy as it minimizes errors associated with load effects.
Limitations of Voltmeters:
- Current Draw Issues:
Standard voltmeters typically have lower resistance compared to potentiometers, causing them to draw a certain amount of current from the circuit. This current draw can lead to a voltage drop across the circuit, resulting in inaccurate measurements.
- Effect on Circuit:
Since voltmeters can affect the circuit's operation, they are less reliable for precise measurements, especially in sensitive electronic applications.
In summary, the accuracy of a potentiometer in measuring potential difference stems from its ability to avoid drawing current from the external circuit, making it the preferred choice for precise voltage measurements.
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Potentiometer measures the potential difference more accurately than a voltmeter, becausea)It draws a heavy current from external circuit.b)It does not draw current from external circuit.c)it has a wire of low resistance.d)it has a wire of high resistanceCorrect answer is option 'B'. Can you explain this answer? for Class 12 2026 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Potentiometer measures the potential difference more accurately than a voltmeter, becausea)It draws a heavy current from external circuit.b)It does not draw current from external circuit.c)it has a wire of low resistance.d)it has a wire of high resistanceCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Potentiometer measures the potential difference more accurately than a voltmeter, becausea)It draws a heavy current from external circuit.b)It does not draw current from external circuit.c)it has a wire of low resistance.d)it has a wire of high resistanceCorrect answer is option 'B'. Can you explain this answer?.
Potentiometer measures the potential difference more accurately than a voltmeter, becausea)It draws a heavy current from external circuit.b)It does not draw current from external circuit.c)it has a wire of low resistance.d)it has a wire of high resistanceCorrect answer is option 'B'. Can you explain this answer? for Class 12 2026 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Potentiometer measures the potential difference more accurately than a voltmeter, becausea)It draws a heavy current from external circuit.b)It does not draw current from external circuit.c)it has a wire of low resistance.d)it has a wire of high resistanceCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Potentiometer measures the potential difference more accurately than a voltmeter, becausea)It draws a heavy current from external circuit.b)It does not draw current from external circuit.c)it has a wire of low resistance.d)it has a wire of high resistanceCorrect answer is option 'B'. Can you explain this answer?.
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