1. UNIT-7
ELECTRICITY AND MAGNETISM
By Carmen Ramos
2. ·What are the materials called when they
attract objects made of steel or iron?
They are called They are called
metals magnetic
They are called
minerals
3.
4.
5. STATIC ELECTRICITY
Static electricity occurs when you rub objects together.
Objects can be:
·Neutral: This is when an object has a different
number of positive and negative charges
·Electrically charged: This is when an object has a
different number of positive charges and negative charges
6. OBJECT BEHAVIOUR TOWARDS ELECTRICITY
Depending on their electrical charges,
different things occur when two objects
with electrical charge are near each other:
·Objects with different electrical
charges attract each other.
Like when you comb your hair.
·Objects with the same electrical charges
repel each other. Like when you rub two
inflated ballons with a piece of wool.
7. CONDUCTING AND INSULATING MATERIALS
·Conducting materials: Electrical charges can move
through them easily.
·Insulating materials: Electrical charges cannot move
through them.
8. ELECTRIC CIRCUITS
Electric current is the movement
of electrical charges through a
conducting material.The main
parts of an electric circuit are:
·Current generator.
·Conducting elements or wires.
·Devices or receivers:
·Switch.
·Electricity meter.
·Protection devices or circuit breakers.
9. USES OF ELECTRIC CURRENT
Electric current has many uses:
·Light, images and sound.
·Heat.
·Movement.
·Communication.
10. MAGNETS
Magnets can attract certain metals. They can be:
·Natural: like magnetite
·Artificial.
All materials have two parts , their north poles (N) and
their south poles (S).
CHARACTERISTICS OF MAGNETS
·You can never separate the poles of a magnet
·When we put two magnets together,
two things can happen:
-They repel.
-They attract.
11. THE MAGNETIC POLES OF THE EARTH
Our planet has a north magnetic pole and a south magnetic
pole. We use a compass to show us where the Earth’s north
magnetic pole is.
USES OF MAGNETISM
Magnetism has different uses:
·Orientation.
·Magnets.
·Information storage.
·Theft control.
·Identification.
