3. Uses of Light
• Artificial light sources
help you see things
inside a dark room.
• Lights can be a decoration
to houses especially on
special occasions
• Some toys produce lights
which makes more exciting
and fun to play with.
4. • Colored lights served as warning
signals to people. A red traffic
light means STOP, green for GO,
and yellow for WAIT.
• For pedestrians, you can cross
the street when you see this
green-colored sign.
5. Uses of Heat
• The sun keeps the Earth
warm and gives energy to
living things.
• Heat is needed to cook
food, boil water for making
hot beverages and warm up
water for bathing when it
is cold.
6. Uses of Sound
• People create sound to
communicate
• Music is produced by
sounds that are either
sung by voices or played
with musical instruments.
• Some sounds warn people
of a particular danger.
7. Uses of Electricity
• Most of the things
that people use are
run by electricity.
• Electricity makes
communication
possible regardless
of distance.
• Electricity
provides power in
our houses.
