Solutions of Electricity (Page No- 5) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

Class 10 Physics Solutions By Lakhmir Singh & Manjit Kaur

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Class 10 : Solutions of Electricity (Page No- 5) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

The document Solutions of Electricity (Page No- 5) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev is a part of the Class 10 Course Class 10 Physics Solutions By Lakhmir Singh & Manjit Kaur.
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Lakhmir Singh Physics Class 10 Solutions Page No:5

Question 1:
By what other name is the unit joule/coulomb called ?
Solution :
Volt

Question 2:
Which of the following statements correctly defines a volt ?
(a) a volt is a joule per ampere.
(b) a volt is a joule per coulomb.
Solution :
(b) a volt is a joule per coulomb.

Question 3:
(a) What do the letters p.d. stand for ?
(b) Which device is used to measure p.d. ?
Solution :
(a) p.d. stands for potential difference.
(b) Voltmeter is used to measure p.d.

Question 4:
What is meant by saying that the electric potential at a point is 1 volt ?
Solution :
Electric potential at a point is 1 volt means 1 joule of work is done in moving 1 unit positive charge from infinity to that point.

Question 5:
How much work is done when one coulomb charge moves against a potential difference of 1 volt ?
Solution :
Potential difference = 1 V
Charge moved = 1C
Work done = Potential difference x Charge moved
= 1 x 1 = 1 J

Question 6:
What is the SI unit of potential difference ?
Solution :
Volt

Question 7:
How much work is done in moving a charge of 2 C across two points having a potential difference of 12 V ?
Solution :
Given,
Potential difference = 12 V,Charge moved = 2 C
We know that,
Work done= p.d. x charge moved
= 12 x 2
= 24 joules.

Question 8:
What is the unit of electric charge ?
Solution :
Coulomb

Question 9:
Define one coulomb charge.
Solution :
One coulomb of charge is that quantity of charge which exerts a force of 9 × 109 Newton on an equal charge is placed at a distance of 1 m from it.

Question 10:
Fill in the following blanks with suitable words :
(a) Potential difference is measured in………….. by using a……………. placed in………… across a component.
(b) Copper is a good………….. Plastic is an……………
Solution :
(a) volts; voltmeter; parallel
(b) conductor; insulator

Question 11:
What is meant by conductors and insulators ? Give two examples of conductors and two of insulators.
Solution :
Conductors:- Those substances through which electricity can flow are known as conductors. E.g., Copper, silver etc.
Insulators:- Those substances through which electricity cannot flow are known as insulators. E.g., Plastic, cotton etc.

Question 12:
Which of the following are conductors and which are insulators ?
Sulphur, Silver, Copper, Cotton, Aluminium, Air, Nichrome, Graphite, Paper, Porcelain, Mercury, Mica, Bakelite, Polythene, Manganin.
Solution :
Conductor:- Silver, Copper, Aluminum, Nichrome, Graphite, Mercury, Manganin
Insulators:- Sulphur, Cotton, Air, Paper, Porcelain, Mica, Bakelite, Polythene

Question 13:
What do you understand by the term “electric potential” ? (or potential) at a point ? What is the unit of electric potential ?
Solution :
The electric potential (or potential) at a point in an electric field is defined as the work done in moving a unit positive charge from infinity to that point.
Unit of electric potential is volt.

Question 14:
(a) State the relation between potential difference, work done and charge moved.
(b) Calculate the work done in moving a charge of 4 coulombs from a point at 220 volts to another point at 230 volts.
Solution :
(a) Potential difference = Work done/Charge moved.
(b) V1=220 V, V2=230V, Charge moved=4C
Thus, the potential difference= V2- V1 =230-220
=10.
We know that,
Work done = Potential difference x Charge moved
= 10 x 4
Work done = 40 joules

Question 15:
(a) Name a device that helps to measure the potential difference across a conductor.
(b) How much energy is transferred by a 12 V power supply to each coulomb of charge which it moves around a circuit ?
Solution :
(a) Voltmeter
(b) Given : Potential difference = 12V, Charge moved=1C
We know that,
Work done = Potential difference x charge moved
= 12 x 1 = 12 joules
Since work done on each coulomb of charge is 12 joules, the energy given to each coulomb of charge is also 12 joules.

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