This document discusses electricity and electric charges. It explains that there are two types of electric charges - positive and negative. Opposite charges attract each other, while similar charges repel. The standard unit of electric charge is the coulomb. All matter contains positively charged protons and negatively charged electrons. Substances can be conductors or insulators depending on how easily electric charges can flow through them. Electric potential is defined as the work required to move a positive charge from infinity to a given point in an electric field.

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view, we writes a book in such a style
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4. Electricity is an important
source of energy in the modern times.
Electricity is used in our homes for
lighting, operating fans and heating
purposes. In industry ,electricity is
used to run various types of machines, and
in transport sector electricity is being used
to pull electricity trains.
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5. It has been found by experiments that
There are two types of electric charge:
Positive Charge and Negative Charge.
By convention , the charge acquired by a
glass rod is called positive charge and the
charge acquired by an ebonite rod is called
Negative charge.

6. (1)Opposite charges (or Unlike charges)
attracts each other. for example, a
positive charge attracts a negative
charge.
(2)Similar charge (or like charges)
repel each other. For example, a
positive charge repel each other.

7. The S I unit of electric charge is coulomb
which is denoted by the letter C. We can
define this unit of charge as follows:
One coulomb is that quantity of electric
charge which exerts a force of 9 * 10 the
power 9 newtons on an equal charge
placed at a distance of 1 metre from it.
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8. We now know that all the
matters contains positively
charged particles called
protons and negatively charged
particles called electrons.
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9. In some substances, the electric
charges can flow, easily while in others
they cannot. So, all the substances can
be divided mainly into two electrical
categories: conductors and insulators.
Those substances through which electric
charges can flow, are called conductors.
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10. When a small positive test charge is placed in the
electric field due to another charge, it experiences a
force. The electric 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.
Potential Is denoted by the symbol V and it’s
unit is Volt. A potential of 1 volt at a point
means that 1 joule of work is done in moving 1
unit positive charge from infinity to that point.
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