Electricity Review
1. a) All matter is made up of atoms. The three subatomic particles
that make up an atom are protons, electrons and neutrons
b)
Two types are charges are negative and positive. Negative charges are
caused by an excess of electrons. Positive charges are caused by a deficit
of electrons.
c) The law of electric charges states:
i)
Negative charges repel negative charges
ii)
Positive charges repel positive charges
iii)
Positive charges attract negative charges
d) Complete the following table:
Method of
Description of Process
Charging
Friction
See Textbook
Contact
Induction
(Temporary)
Final charge
on Objects
Transfer of
Electrons
+ or -
Some
See Textbook
+ or -
Some
See Textbook
Neutral
None
2. a) A conductor is a conductor of electrons. An example of a good conductor
is copper.
b) An insulator is a poor conductor of electrons.
An example of a good insulator is wood.
3. a) To ground an object simply connect a wire to
the ground.
b) Discharging objects is easier when the air is dry.
c) Four ways to discharge an object are:
i) discharge at a point
ii) connect to ground
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