Electricity is a form of energy resulting from charged particles like electrons or protons. An electric current is defined as the flow of electric charge between two bodies at different electric potentials through a conducting material. Originally, it was thought that electric current was caused by the motion of positive charges, but it was later discovered to be caused by the flow of electrons. The strength of an electric current is defined as the rate at which electric charges flow across a cross section of a conductor and is measured in amperes. An electric circuit is the systematic arrangement of electrical components and their connections.

2. Electricity a form of energy resulting
from the existence of charged particles
(such as electrons or protons), either
statically as an accumulation of charge
or dynamically as a current.

3. WHAT IS
ELECTRIC CURRENT?
The flow of charge between two bodies at different potential difference
through a conducting material constitute an electric current.

4. In the early stages of development of electricity, it was
thought that the motion of charges constitute the electric
current.Thus the electric current was due to the motion of
positive charges from higher potential to lower potential.
Later, it was discovered that it is not the positive charges,
but the free electrons which constitutes the flow of
charges.
By that time , many theories were developed based on the
prior assumption. So scientists retained that concept and it
was considered that electric current due to the motion of the
positive charges as ‘conventional electric current’.Thus the
directions of conventional electric current and the direction
of flow of electrons are opposite to each other.
DO YOU
KNOW?

5. The strength of electric current is defined as the rate at which charges move across
a cross section of a conductor.
Mathematically, i=q/t
where ‘i’ is the electric current, ‘q’ is the amount of charge flowing through a given
cross section of a conductor and ‘t’ is the time in which the flow of charges takes
place.
The unit of strength of electric current= unit of charge /unit of time = 1 coulomb/1 second =
1 C s-1.
And 1 coulomb per second is called 1 ampere(A).Thus 1 A= 1 C s -1
Hence, 1 ampere is defined as the electric current established in a conductor when one
coulomb charge flows through a given cross section of the conductor in one second.

6. WHAT IS
ELECTRIC CIRCUIT?
The systematic arrangement of all the electrical
components and their connections is called an
electric circuit.

7. The symbolic or schematic representation of
electrical components and their connections is
known as a ‘circuit diagram’.
WHAT DO YOU MEAN BY A
CIRCUIT DIAGRAM?

8. SOME EXAMPLES OF CIRCUIT
DIAGRAMS & COMPONENTS;

9. SOME OF THE ELECTRICAL SYMBOLS ARE GIVEN HERE;

10. SAVE ELECTRICITY
SO THAT YOU CAN VIEW AND DO MORE PRESENTATIONS IN THE
FUTURE

12. PRESENTED BY
P CHIRANJITH PRABHU
CLASS X
KENDRIYA VIDYALAYA EZHIMALA