There are two types of electricity:
1.) Current Electricity
is caused by tiny invisible
things called electrons that move
through metal. This flow is called
an electric current. Objects that
need current electricity (moving electricity)
are powered by batteries or by electricity
which travels along wires from a power
station. The circuit is completed
by a switch, which turns the appliance
on. When the switch is turned off,
the circuit is broken and the appliance
is turned off.
Many objects that we use in our every
day routine are powered by electricity
from computers and hairdryers to lamps
and washing machines.
NOTE: If you attempt
to do any experiments which involve
use the electricity form a plug or
socket. It is very powerful and very
dangerous. You should only use batteries
for electrical experiments.
2.) Static Electricity
- this type of electricity
stays in one place. Static electricity
is produced when some materials are
rubbed together. Static electricity
is the result of an imbalance between
negative and positive charges in an
object. These charges can build up
on the surface of an object until
they find a way to be released or
discharged. One way to discharge them
is through a circuit.
How does static electricity
work? Static electricity
happens when there is an imbalance
between negative and positive charges
in objects. It causes crackles when
you comb your hair and makes dust
stick to television screens. Static
electricity experiments work best
on a dry day.
is caused by a natural build-up of
in clouds. The lightning strike is
just a giant spark of electricity.
Lightning and certain eels (electrical
eels) display it worldwide.
- Have you ever walked across the
room to pet your dog, but got a
The rubbing of certain materials
against one another can transfer negative
charges or electrons. For example,
if you rub your shoe on the carpet,
your body collects extra electrons.
The electrons cling to your body until
they can be released. As you reach
and touch your furry friend, you get
a shock. Don’t worry; it is
only the surplus electrons being released
from you to your unsuspecting pet.
- Have you ever taken your hat
off on a dry winter’s day
and had a “hair raising”
As you remove your hat from your
head, electrons are transferred from
the hat to your hair, creating and
re-arranging your interesting hairdo.
Remember, objects with the same charge
repel each other. Because they have
the same charge, your hair will stand
on end. Your hairs are simply trying
to get as far away from each other
Colder climates have static electricity.
Combs attract bits of paper.
Clothing "clings" to your
body is caused by static electricity..
- Have you ever made a balloon
cling on to a wall after rubbing
it against your clothes?
When you rub a balloon against your
clothes and it sticks to the wall,
you are adding a surplus of electrons
(negative charges) to the surface
of the balloon. The wall is now more
positively charged than the balloon.
As the two come in contact, the balloon
will stick because of the rule that
opposites attract (positive to negative).
All physical objects are made up
of atoms. Inside an atom are protons,
electrons and neutrons. The protons
are positively charged, the electrons
are negatively charged, and the neutrons
are neutral. Therefore, all things
are made up of charges. Opposite charges
attract each other (negative to positive).
Like charges repel each other (positive
to positive or negative to negative).
Most of the time positive and negative
charges are balanced in an object,
which makes that object neutral.