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In measuring resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeter should be connected
- a)across the supply
- b)across the resistance
- c)either across the supply or across the resistance
- d)neither across the supply nor across the resistance
Correct answer is option 'B'. Can you explain this answer?
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In measuring resistance by voltmeter-ammeter method, the voltmeter can...
Explanation:
The voltmeter-ammeter method is a commonly used technique to measure resistance in electrical circuits. In this method, an ammeter is connected in series with the resistance being measured, and a voltmeter is connected in parallel either across the supply or across the resistance.
When the resistance is low, it means that the value of the resistance is small, and there is a high current flowing through it. In this case, connecting the voltmeter across the supply would result in inaccurate measurements.
Reasons for connecting the voltmeter across the resistance:
1. Accuracy: When the voltmeter is connected across the resistance, it directly measures the voltage drop across the resistance. This provides a more accurate measurement of the resistance value, as it eliminates the voltage drop across the connecting wires and other components in the circuit.
2. Voltage division: When the voltmeter is connected across the supply, it measures the total voltage across the circuit, which includes the voltage drop across the resistance and other components in the circuit. This would result in a higher reading on the voltmeter, as it includes additional voltage drops that are not solely due to the resistance being measured.
3. Minimizing errors: By connecting the voltmeter across the resistance, errors due to the resistance of the connecting wires and other components in the circuit are minimized. This helps in obtaining more accurate resistance measurements.
Conclusion:
In conclusion, when the resistance being measured is low, it is advisable to connect the voltmeter across the resistance rather than across the supply. This ensures accurate measurements and minimizes errors caused by voltage drops across other components in the circuit.
The voltmeter-ammeter method is a commonly used technique to measure resistance in electrical circuits. In this method, an ammeter is connected in series with the resistance being measured, and a voltmeter is connected in parallel either across the supply or across the resistance.
When the resistance is low, it means that the value of the resistance is small, and there is a high current flowing through it. In this case, connecting the voltmeter across the supply would result in inaccurate measurements.
Reasons for connecting the voltmeter across the resistance:
1. Accuracy: When the voltmeter is connected across the resistance, it directly measures the voltage drop across the resistance. This provides a more accurate measurement of the resistance value, as it eliminates the voltage drop across the connecting wires and other components in the circuit.
2. Voltage division: When the voltmeter is connected across the supply, it measures the total voltage across the circuit, which includes the voltage drop across the resistance and other components in the circuit. This would result in a higher reading on the voltmeter, as it includes additional voltage drops that are not solely due to the resistance being measured.
3. Minimizing errors: By connecting the voltmeter across the resistance, errors due to the resistance of the connecting wires and other components in the circuit are minimized. This helps in obtaining more accurate resistance measurements.
Conclusion:
In conclusion, when the resistance being measured is low, it is advisable to connect the voltmeter across the resistance rather than across the supply. This ensures accurate measurements and minimizes errors caused by voltage drops across other components in the circuit.
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In measuring resistance by voltmeter-ammeter method, the voltmeter can...
V–A Method:
In this method, the voltmeter is connected across the supply.
V = Voltmeter reading
A = Ammeter reading
VL = Voltage across load R.
IL = Current flowing through load R.
R = Unknown resistance to be measured
Ra = Internal resistance of the ammeter
Va= voltage drop across ammeter.
V = VL + Va
So, in this method measured value is greater than the true value. This error is due to an ammeter.
The error is high for very low values of unknown resistance R.
So, in this method measured value is greater than the true value. This error is due to an ammeter.
The error is high for very low values of unknown resistance R.
A–V Method:
In this method, the voltmeter is connected across the resistance.
V = Voltmeter reading
A = Ammeter reading
VL = Voltage across load R.
R = Unknown resistance to be measured
IL = Current flowing through load R.
IV = Current flowing through the voltmeter.
The measured value is less than the true value. In this method, the error is due to the voltmeter.
The error is low for very low values of unknown resistance R.
The measured value is less than the true value. In this method, the error is due to the voltmeter.
The error is low for very low values of unknown resistance R.
Observations:
- In both methods errors due to load side instruments.
- V – A method is best suitable for high resistances in the medium range.
- A – V method is best suitable for low resistances in the medium range.
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In measuring resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeter should be connecteda)across the supplyb)across the resistancec)either across the supply or across the resistanced)neither across the supply nor across the resistanceCorrect answer is option 'B'. Can you explain this answer?
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