Science Form 1 - Chapter 6

CHAPTER 6

Sources of Energy 6.1

Various forms and sources of Energy Listing various forms and sources of energy on Earth Identify energy changes Explaining the main source of energy

Click on page as long as red bullet still exist

What is Energy? Energy is defined as the ability to do work

Forms of Energy

Various Forms Of Energy LIGHT ENERGY Energy which enables us to see

Various Forms Of Energy KINETIC ENERGY Energy possessed by a moving object

A flying bird

A moving vehicle

Various Forms Of Energy POTENTIAL ENERGY Energy stored in a body due to its condition or position

Energy stored due to its condition

Energy stored due to its position

Various Forms Of Energy SOUND ENERGY The 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

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 have heat energy. Heat energy can be detected by our skin

Various Forms Of Energy ELECTRICAL ENERGY Energy caused by the flow of electrical current

All the above appliances need energy to function The form of energy that makes them function is called electrical energy.

Various Forms Of Energy CHEMICAL ENERGY Energy stored in a substance

These energy can be released during burning or respiration

We can get energy we need to do work form our food. Burning fuels such as petrol, coal and firewood gives us heat energy.

Various Forms Of Energy NUCLEAR ENERGY Released from fission or fusion reactions which occur in atomic nuclei

Nuclear energy is obtained from elements such as plutonium and uranium.

Nuclear energy is mostly used to generate electicity. Some ships and submarines are powered by nuclear energy

Sources of energy Fossil Fuels

Coals, petroleum, natural gas are examples of fossil fuels. Burning of fossil fuels produces heat and light They are used for cooking, generating electrical energy, heating homes during winter, etc.

The sun as the primary source of energy

Earth

Air Water Wind

Wave

Plants Geothermal Animals

Cloud

Fossil Fuels

Rain

Biomass

Hydro energy Natural gas

Coal

Petroleum

Radioactive metals

Energy Changes Chemical Electrical Light Heat Iron

Heat A lighted candle

Solar

Chemical Kinetic

Solar panel

Electrical

Lawn mower

Electrical Wind Kinetic Electrical radio

Sound

Wind electric generator

CHAPTER 6

Sources of Energy 6.2

Renewable and Non-renewable Energy Define renewable and non-renewable sources of energy Group the various sources of energy into renewable and non-renewable energy Explain why we need to conserve energy Suggest ways to use energy efficiently

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 ENERGY Energy that cannot be replaced and will finally be used up.

ENERGY SOURCES ON EARTH

RENEWABLE

• Wind •Geothermal •Sun •Waves •Biomass •Water

NON - RENEWABLE

•Petroleum •Natural gas •Coal

Fossil Fuel

•Plutonium •Uranium

Radioactive metals

Non-renewable energy Fossil Fuels Coals, petroleum, natural gas are examples of fossil fuels. They are formed from dead animals and plants which died millions of years ago. fossil fuels are considered non-renewable because they take so long to form and therefore cannot be replaced.

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