Table of Contents
- 1 Why potentiometer method is considered as an accurate method for measuring potential difference?
- 2 Why potentiometer is an accurate measuring device?
- 3 Why does a potentiometer measure emf of a cell more accurately than a voltmeter?
- 4 Why is a potentiometer an accurate and versatile device to make electrical measurements of emf?
- 5 Which device is used to measure potential difference accurately?
- 6 Why is voltmeter less accurate in measuring potential difference than a potentiometer?
- 7 Why do we prefer potentiometer?
- 8 Which of the following qualifies as an accurate and versatile method for solving PFE?
- 9 Why is potentiometer preferred over voltmeter for measurement of potential difference?
- 10 What is a potentiometer circuit used for?
- 11 How do you calibrate a potentiometer?
Why potentiometer method is considered as an accurate method for measuring potential difference?
Potentiometer measures the potential difference more accurately than a voltmeter because it does not draw current from external circuit.
Why potentiometer is an accurate measuring device?
Since the reference voltage can be produced from an accurately calibrated voltage divider, a potentiometer can provide high precision in measurement. At that point the galvanometer draws no current from the unknown source, and the magnitude of voltage can be calculated from the position of the sliding contact.
Why is potentiometer more accurate than voltmeter?
The potentiometer is preferred over voltmeter when there is a measurement of emf of the cell because the potentiometer does not draw any current as it is a null device. This is the reason why potentiometer is preferred over voltmeter in order to get the actual measurement of emf.
Why does a potentiometer measure emf of a cell more accurately than a voltmeter?
Note: The potentiometer accurately measures the emf because it has zero internal resistance while voltmeter has an appreciable magnitude of resistance and when current moves through it there is a potential drop which the voltmeter measures accurately.
Why is a potentiometer an accurate and versatile device to make electrical measurements of emf?
A potentiometer is an accurate and versatile device to make electrical measurements of emf because the method involves a condition of no current flow through the galvanometer, the device can be used to measure potential difference, internal resistance of a cell and compare emf’s of two sources.
How can you increase the accuracy of a potentiometer?
Increasing the length of the wire helps to increase the accuracy of the potentiometer.
Which device is used to measure potential difference accurately?
Voltmeter
4.6
| S.No | Voltmeter |
|---|---|
| 1. | It is a device used to measure potential difference and is always put in parallel with the ‘circuit element’ across which potential difference is to be measured. |
| 2. | Ideally, the voltmeter has infinite resistance. |
Why is voltmeter less accurate in measuring potential difference than a potentiometer?
Voltmeter is less accurate in measuring the potential difference than a potentiometer. Because voltmeter withdraws some current from the main circuit. As a result main current in the circuit decreases and hence the potential difference measured by the voltmeter is not equal to its actual value.
Why would a potentiometer be expected to give a more accurate value for the emf than a moving coil voltmeter?
While a voltmeter draws a small current from the cell for its operation.So it measures the terminal p.d. in a closed circuit which is less than the emf of a cell. That is why a potentiometer is preferred over a voltmeter for measuring the emf of a cell.
Why do we prefer potentiometer?
A potentiometer with longer bridge wire will have a small potential gradient. Due to it, it becomes more sensitive. Hence it is preferred.
Which of the following qualifies as an accurate and versatile method for solving PFE?
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F.
What will be the advantage if length of potentiometer wire is increased?
If the length of potentiometer wire is increased, then the length of the previously obtained balance point will increase. Explanation: The potential gradient decreases as the length of the potentiometer wire are increased, and the length of the prior balance point increases.
Why is potentiometer preferred over voltmeter for measurement of potential difference?
For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because. The resistance of the potentiometer is less than voltmeter. Why is a potentiometer preferred over a?
What is a potentiometer circuit used for?
A potentiometer circuit can be used for comparing and measuring potential differences, the principle of action being that the unknown EMF is measured by balancing it against a known potential difference.
What is the resistance of a potentiometer?
A potentiometer has very large resistance. To read load voltage or voltage across any circuit element, potentiometer is connected parallely across it.
How do you calibrate a potentiometer?
A potentiometer circuit: G, galvanometer. The potentiometer wire is calibrated using a standard cell whose potential difference is accurately known by determining the position of the slide along the wire which gives a null deflection. The standard cell is replaced by the unknown voltage, and the corresponding new balance point is found.