Science Year 4 - Energy

SCIENCE YEAR 4
UNIT 7 - ENERGY

Cikgu Siti Arfifah binti Jais

In this chapter, you will learn:

Meaning of energy and sources of energy
•8 sources of energy
•Renewable and non-renewable energy sources
Forms of energy
•9 forms of energy
•Energy cannot be created and destroyed

Transformations of energy

Use energy wisely

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Meaning of energy

Energy is ability to do work.
To carry out lot of works, we need a lot

of energy too!

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Sources of energy Text 124
book -

125

SUN WIND NUCLEAR
Main source of Rotate windmill Decomposition of
→generate electricity nuclear sustances
energy (eg: uranium) →
generate electricity
WATER FOSSIL FUEL
Rotate turbine in Petroleum, natural GEOTHERMAL
hydroelectric dam gas, coal are burned Heat of hot rock
→generate electricity →generate electricity beneath the earth

BIOMASS WAVES surface
From natural waste Rotate turbine in

(plant or animal ocean
feaces) →generate electricity

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Energy sources Text 134
book

Renewable Non-renewable

Energy sources that can be Energy sources are limited
generated continuously (sumber boleh habis guna)

Solar / sun wave water coal

Fossil nuclear
fuel
petroleum

wind biomass geothermal

Cikgu Siti Arfifah binti Jais natural gas

Nuclear Text 126
energy book -

Kinetic 127
energy

Solar

energy 2. Forms Potential
of energy
Heat
energy energy Chemical

Light energy

energy

Sound Electrical
energy energy

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Nuclear energy Electrict
energy
Light
energy

Sound
energy

Potential Kinetic chemical
energy energy energy
Solar
energy Heat
energy
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Text 132
book -

133

Energy cannot be created Transformation Next
or destroyed, it can only of energy. slide
be changed from one
form to another.

-Albert Einstein

Energy can be
changed from one

form to another

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Transformations of energy Text 128
book -

130

cchheemmicicaal l light chemical kinetic

chemical kinetic electrict light

electrict heat electrict sound

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Solar energy

chemical chemical light
energy energy energy

cc heat
energy
c
c

Solar chemical cehnecemcrigcyal light heat
energy energy energy energy
Symbol
Cikgu Siti Arfifah binti Jais Symbol means change to
means and

The boy at high potential kinetic potential
place, ready to energy energy energy

skate down kinetic The boy reach
energy high place, ready

to skate down

The boy moving on his skate board

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Can you identify the transformations of
energy that occur in this situation?

A boy is spinning
the spit.

chemical Kinetic The chicken is being
energy energy grilled over fire wood

boy spinning Heat
energy
chemical
energy Fire

Fire wood

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4. Using energy wisely

Most of energy that we use today is comes from

non-renewable energy sources. Coals are from

fossil fuel sources.

Coals are burned at a power plant to cc
generate electricity.

Smoke (contains cc We use the electric
carbon) released energy to help us carry

to the air out daily activity.

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General knowledge : Power Plant in our country

Jimah Power Plant, Selangor

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Fuel at petrol kiosk The car use the fuel to get
energy. When we drive
Cikgu Siti Arfifah binti Jais the car, the combustion of
fuel will release carbon

from the exhaust.

Why we must use energy wisely?

The more we use
energy, the more
we consume the
non-renewable
energy sources.

→ depletion of
energy sources

The more we The more we use
use energy,
the more we energy, the more
have to pay.
we emit carbon
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to the air.
→ air pollution

Vocabularies

Vocabulary Explanation Text Vocabulary Explanation Text
book book
ability keupayaan 124 coal arang batu 124
124 derived obtained 124
generate menjana 124 form bentuk 126
124 emit memancarkan 126
Rotate memutar stretched diregangkan 127
124 compressed dimampatkan 127
Turbine Parts that rotate to 124 transform change the form 128
generate electricity 124 flame fire 128
destroyed dimusnahkan 132
dam empangan

subsntance bahan

feaces Refer topic
defecation
Waste from
animals

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Vocabularies

Vocabulary Explanation Text Vocabulary Explanation Text
book book
134
renewable diperbaharui 134 combustion pembakaran
Non-
renewable Tidak boleh 134 Coal Pembakaran rang
limited diperbaharui
136 combustion batu
sufficient Terhad 136
wisely (will run out after Fuel Pembakaran
depletion certain duration) combustion bahan api

enough consume menggunakan

berhemah Power plant Stesen janakuasa

Kehabisan continuously berterusan
run out

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Sekian Terima Kasih

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