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(a) What do you understand by the term potential difference"?(b) What is meant by saying that the potential difference between two points is 1 volt?(c) What is the potential difference between the terminals of a battery if 250 joules of work is required to transfer 20 coulombs of charge from one terminal of battery to the other?(d) What is a voltmeter? How is a voltmeter connected in the circuit to measure the potential difference between two points. Explain with the help of a diagram.(e) State whether a voltmeter has a high resistance or a low resistance. Give reason for your answer."
(a) Potential difference between two points in an electric circuit is defined as the amount of work done in moving a unit charge from one point to the other.
(b) The potential difference between two points is 1volt means that 1 joule of work is done in moving 1 coulomb of electric charge from one point to the other.
(c)
Given : Work done =250J, Charge moved =20C.
we know that ,
$\text{Potential difference} = \frac{\text{Work done}}{\text{ Charge moved}}$
=$\frac{250}{20}=12.5 V$
(d) A voltmeter is a device that is used to measure the potential difference between two points in an electric circuit. A voltmeter is always connected in parallel across the two points where the potential difference is to be measured.
![](/assets/questions/media/158637-32836-1606368758.png)
(e) Voltmeter has high resistance.
As the voltmeter is connected in parallel, it should have very high resistance. The high resistance makes sure that it takes a negligible current from the circuit.
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