Electricity
Electricity is an inevitable part of our lives.
It has a variety of uses
in homes, schools, hospitals
industries and .....
It is a controllable and convenient form of
energy that means we can make the
electricity flow in a desired path in a
desired direction and in a required quantity
To understand this we need to
know answers to certain questions.
What is the flow of electricity called ?
What is the path in which electricity flows ?
How to construct the path ?
What are the factors that influence the flow of electricity?
Before we know answers to these questions
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Coming back to our lesson
The flow of electric charge
through a conductor is called electric current.
A continuous and closed path of
an electric current is called an
electric circuit.
A general electric circuit contains
1. Electric cell - it is a source of electricity
2. Wire - it is the conductor of electricity
3. Switch - it is the controller of electricity
4. Load - It is the user or
final converter of electricity
When the circuit is closed
the electric charge from the cell is passed  through the wire
to the bulb which makes the bulb to glow
Now if the circuit is broken by turning
switch off the current stops flowing and
the bulb does not glow. In circuits using
metallic wires electrons constitute the
flow of charges however electrons were
not known at that time when the
phenomenon of electricity was first
observed. So electric current was
considered to be the flow of positive
charges and the direction of flow of
positive charges
was taken to be the direction of
electric current. Conventionally in an
electric circuit the direction of
electric current is taken as opposite to
the direction of the flow of electrons
which are negative charges.
So we have
learnt about electric current and
electric circuit then how do we express
electric current ?
This we will learn in the next video.
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