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Click on page as long as red bullet still exist

CHAPTER 6

Sources of Energy

Listing various forms and sources of energy onEarth

Identify energy changes

Explaining the main source of energy

6.1

Various forms and sources of Energy

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Energy is defined as the ability to do work

What is Energy?

Forms o f Energy 

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Various Forms Of Energy

LIGHT ENERGYEnergy which enables us to see

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Various Forms Of Energy

KINETIC ENERGYEnergy possessed by a moving object

A moving vehicle

A flying bird

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Various Forms Of Energy

POTENTIAL ENERGYEnergy stored in a body due to its condition or position

Energy stored due to itscondition

Energy stored due to itsposition

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Various Forms Of Energy

SOUND ENERGYThe energy produced by vibrating object

Sound energy can be

detected by our ears.

Sound energy is important

because it enables us to

communicate and have

entertainment.

Sound is also used to alert

people of something

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Various Forms Of Energy

HEAT ENERGY

We know from our experience in

daily life that the condition

shown in these pictures feels

hot.

We say that the objects haveheat energy.

Heat energy can be detected by

our skin

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Various Forms Of Energy

ELECTRICAL ENERGY

Energy caused by the flow of electrical current

The form of energy that makes

them function is called

electrical energy.

All the above appliances need

energy to function

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Various Forms Of Energy

CHEMICAL ENERGY

Energy stored in a substance

We can get energy we need to do work

form our food. Burning fuels such as

petrol, coal and firewood gives us heat

energy.

These energy canbe released during

burning or

respiration

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Various Forms Of Energy

NUCLEAR ENERGY

Released from fission or fusion reactions which occur in atomic nuclei

Nuclear energy is

obtained fromelements such as

plutonium and

uranium.

Nuclear energy is mostly

used to generate electicity.Some ships and submarines

are powered by nuclear

energy

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Sources of energy

Fossil Fuels

Coals, petroleum,natural gas are

examples of fossil

fuels.

Burning of fossilfuels produces heat

and light

They are used for

cooking, generating

electrical energy,

heating homes

during winter, etc.

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The sun as the primary source of energy

Air 

Wind

Wave

Water

Cloud

Rain

Hydro energy

Plants

Animals

Fossil Fuels Biomass

Natural gas Coal Petroleum

Earth

Radioactivemetals

Geothermal

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Energy Changes

Electrical

Heat

Solar

Electrical

Electrical

Kinetic

Sound

Chemical

Light

Heat

Chemical

Kinetic

Wind

Electrical

Iron

Solar panel

radioWind electric generator 

Lawn mower 

 A lighted candle

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CHAPTER 6

Sources of Energy

Define renewable and non-renewable sources ofenergy

Group the various sources of energy into

renewable and non-renewable energy

Explain why we need to conserve energySuggest ways to use energy efficiently

6.2 Renewable and Non-renewable Energy

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Renewable & Non-renewable

RENEWABLE ENERGY

Energy that can be replaced when they have been used.MEANS : the supply of these energy sources will not be used up

NON-RENEWABLE ENERGYEnergy that cannot be replaced and will finally be used up.

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ENERGY SOURCES ON EARTH

RENEWABLE NON - RENEWABLE

• Wind

•Geothermal

•Sun

•Waves•Biomass

•Water 

•Petroleum

•Natural gas

•Coal

•Plutonium

•Uranium

Fossi l Fuel 

Radioactive

metals 

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Non-renewable energy

Coals, petroleum, natural gas are examples of

fossil fuels.

They are formed from dead animals and plantswhich died millions of years ago.

fossil fuels are considered non-renewable

because they take so long to form and thereforecannot be replaced.

Fossil Fuels

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