Class 10 NCERT Physics Chapter 11: Electricity : Notes (NCERT Notes PDF Included)

 

Chapter 12: ELECTRICITY

NOTES

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Overview

Basic Knowledge

1.1) Electric Current:

Rate of flow of charge through current carrying conductor is known as Electric Current

   Electric Current is expressed by the amount of charge flowing through a particular area per unit time

     Direction of Electric Current:

It is taken opposite to the direction of the flow of electrons (negatively charged particles).

It is not taken as the direction of the motion of the electrons because electric current was discovered before the discovery of the electrons, so scientists assumed that electric current constitute positively charged particles (whose direction is opposite than that of the electrons). This direction was taken and was worldwide accepted, but after the discovery of electrons, scientists did not modify the direction of and that idea was carried on

     Formula:

Rate of flow of electrons is known as electric current.

                                 I=Q/T

Where I is electric current, Q is Electric Charge and T is Time.

         SI Units:

 SI Unit of electric current is Ampere (A).

1 Ampere of charge is constituted of flow of 1 coulomb of charge per second.

Named after French scientist, Andre-Marie Ampere

1 Ampere = 1000 milliampere (mA)

1 milliampere = 1000 microampere(µA) 

SI Unit of Electric Charge is Coulomb (C)

1 Coulomb of charge contains nearly 6 * 10¹⁸ electrons

      Measuring Device:

Electric Current is measured by a device known as Ammeter.

Connection: It is connected in series in an electric circuit

Series Connection is an end to end connection.