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The voltage of a circuit is measured by a voltmeter whose input impedance is low as compared to the output impedance of the circuit. The error caused will be due to
- a)Random error
- b)Loading effect
- c)Gross error
- d)System error
Correct answer is option 'B'. Can you explain this answer?
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The voltage of a circuit is measured by a voltmeter whose input impeda...
When the voltage of a circuit is measured by a voltmeter whose input impedance is low as compared to the output impedance of the circuit, the instrument gives less accurate results. This is known as the error due to the loading effect.
To reduce this effect, we need to use high impedance voltmeter compared to the load impedance.
Most Upvoted Answer
The voltage of a circuit is measured by a voltmeter whose input impeda...
Explanation:
When a voltmeter is connected to measure the voltage of a circuit, it draws a small amount of current from the circuit. This current causes a voltage drop across the internal resistance of the voltmeter. The voltage drop due to this current is called the loading effect. The loading effect can cause the voltage measured by the voltmeter to be different from the actual voltage of the circuit.
Effect of loading effect:
The loading effect can cause the following errors in the measurement of voltage:
- The voltage measured by the voltmeter may be lower than the actual voltage of the circuit.
- The loading effect can cause a significant error when measuring the voltage of a circuit with a high output impedance.
Low input impedance of the voltmeter:
When the input impedance of the voltmeter is low as compared to the output impedance of the circuit, the loading effect becomes significant. This is because the low input impedance of the voltmeter draws a larger current from the circuit, causing a larger voltage drop across the internal resistance of the voltmeter.
Conclusion:
Therefore, when measuring the voltage of a circuit using a voltmeter, it is important to select a voltmeter with a high input impedance to minimize the loading effect. The loading effect can cause significant errors in the measurement of voltage, which can affect the accuracy of the circuit.
When a voltmeter is connected to measure the voltage of a circuit, it draws a small amount of current from the circuit. This current causes a voltage drop across the internal resistance of the voltmeter. The voltage drop due to this current is called the loading effect. The loading effect can cause the voltage measured by the voltmeter to be different from the actual voltage of the circuit.
Effect of loading effect:
The loading effect can cause the following errors in the measurement of voltage:
- The voltage measured by the voltmeter may be lower than the actual voltage of the circuit.
- The loading effect can cause a significant error when measuring the voltage of a circuit with a high output impedance.
Low input impedance of the voltmeter:
When the input impedance of the voltmeter is low as compared to the output impedance of the circuit, the loading effect becomes significant. This is because the low input impedance of the voltmeter draws a larger current from the circuit, causing a larger voltage drop across the internal resistance of the voltmeter.
Conclusion:
Therefore, when measuring the voltage of a circuit using a voltmeter, it is important to select a voltmeter with a high input impedance to minimize the loading effect. The loading effect can cause significant errors in the measurement of voltage, which can affect the accuracy of the circuit.
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The voltage of a circuit is measured by a voltmeter whose input impedance is low as compared to the output impedance of the circuit. The error caused will be due toa)Random errorb)Loading effectc)Gross errord)System errorCorrect answer is option 'B'. Can you explain this answer?
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