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Chapter 12 Electricity

Electricity is a form of energy that revolutionized the human lifestyle, today life is totally dependent on electric appliances. Electricity even has great advantages as its efficiency, easily transmitted, cleanness. Use of electricity is growing very fast with substitute of natural resources. In this chapter we shall study the basic concept of electricity, electric charge and its properties, conductor and insulator, electric potential, ohm's law, resistance and heating effect of current and its applications.

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Download pdf of NCERT Examplar with Solutions for Class Science Chapter 12 Electricity

Exercise 1

  • Q1 What does an electric circuit mean?
    Ans:

    An electric circuit is a closed  path of conducting wires through which electrons flow in  electric devices, switching devices, source of electricity, etc.


    Q2 Define the unit of current.
    Ans:

    The SI unit of electric current is Ampere. 1 ampere  is defined as the flow of 1 Coulomb  of charge through a wire in 1 second. Smaller unit  of  current  is milliAmpere that is 1/1000 ampere.


    Q3 Calculate the number of electrons constituting one coulomb of charge.
    Ans:

    Charge is flow of number of electrons.

    Q=ne

    Q is charge, n = number, e = electron

    Whereas, One electron possesses a charge of 1.6 × 10−19 C,

     i.e., 1.6 × 10−19 C of charge is contained in 1 electron.

    ∴ 1 C of charge is contained in

    Hence, 6x1018 electrons constitute one coulomb of charge.


Exercise 2

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Exercise 5

Exercise 6

Exercise 7

Exercise 8

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