Question:
It is preferable to measure the e.m.f. of a cell by potentiometer than by a voltmeter because of the following possible reasons.
(i) In case of potentiometer, no current flows through the cell.
(ii) The length of the potentiometer allows greater precision.
(iii) Measurement by the potentiometer is quicker.
(iv) The sensitivity of the galvanometer, when using a potentiometer is not relevant.
Which of these reasons are correct?
It is preferable to measure the e.m.f. of a cell by potentiometer than by a voltmeter because of the following possible reasons.
(i) In case of potentiometer, no current flows through the cell.
(ii) The length of the potentiometer allows greater precision.
(iii) Measurement by the potentiometer is quicker.
(iv) The sensitivity of the galvanometer, when using a potentiometer is not relevant.
Which of these reasons are correct?
Updated On: Jun 23, 2023
- (i), (iii), (iv)
- (i), (iii), (ii)
- (i), (ii)
- (i), (ii), (iii), (iv)
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The Correct Option is C
Solution and Explanation
To measure the emf of a cell we prefer potentiometer rather than voltmeter because
(i) the length of potentiometer which allows greater precision.
(ii) in case of potentiometer, no current flows through the cell.
(iii) of high sensitivity.
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Concepts Used:
Current Electricity
Current electricity is defined as the flow of electrons from one section of the circuit to another.
Types of Current Electricity
There are two types of current electricity as follows:
Direct Current
The current electricity whose direction remains the same is known as direct current. Direct current is defined by the constant flow of electrons from a region of high electron density to a region of low electron density. DC is used in many household appliances and applications that involve a battery.
Alternating Current
The current electricity that is bidirectional and keeps changing the direction of the charge flow is known as alternating current. The bi-directionality is caused by a sinusoidally varying current and voltage that reverses directions, creating a periodic back-and-forth motion for the current. The electrical outlets at our homes and industries are supplied with alternating current.