Intro to Energy Notes.ppt

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Intro to Energy
8th Grade Science

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Energy Resources
Contents
The nature of energy
Energy resources
Fossil fuels
Summary activities

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What is energy?
• Energy is the ability to do work. It can
not be created nor destroyed just
transferred from one form to another.

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Can you think of
examples of each
type of energy?
There are many different types of energy:
thermal
light
sound
elastic
gravitational
kinetic
electrical
chemical
nuclear
Different types of energy

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Which type of energy?

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Energy can be changed from one form to another.
For example:
Chemical energy in food is
converted to thermal energy
and kinetic energy by our bodies.
Energy transfer
What other energy transfers can you think of?
Gravitational energy in a ball is
converted to kinetic energy
when it falls to the ground.

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 burning match
 portable torch
 microphone
 radio
 television
 catapult
 mobile phone
 car
chemical to heat and light
chemical to heat and light
sound to electrical
electrical to sound and heat
electrical to sound and light and heat
elastic to kinetic and heat
chemical to sound and microwaves
(EM radiation) and heat
chemical to kinetic and sound and heat
In all these transfers the energy is not lost, it is conserved.
Energy cannot be destroyed or created.
What energy transfer takes place in each device?
What is the energy transfer?

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7I Energy Resources
Contents
Energy resources
Fossil fuels
Summary activities

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Humans use chemical energy (from food) to live and function.
However, in a modern society we also use large amounts of
energy from other sources.
Can you think of some activities requiring energy?
Where does the energy for these type of activities come from?
 travelling and communicating over long distances;
 controlling our environment, e.g. air conditioning/heating;
 manufacturing and building many kinds of materials and
products, e.g. roads, cars, buildings, prepared food.
Using energy

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Energy resources can be divided into two types:
 renewable (e.g. hydroelectric);
 non-renewable (e.g. coal, oil, nuclear and natural gas).
Energy resources in North Carolina

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17%
41% 32%
8%
2%
gas
oil
coal
nuclear
renewables
Compare the data between the two areas.
Why might they differ?
Record ideas in notebook.
Energy resources in the UK

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There is a finite amount of fossil fuels on the Earth and
they will eventually run out.
Once fossil fuels are used they cannot be regenerated
and used again, so they are called non-renewable.
Non-renewable energy resources
oil coal natural gas
Oil, coal and natural gas are examples of fossil fuels.
They were formed from biological deposits over the course
of millions of years.

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Renewable energy resources
will not run out because they
can easily be regenerated.
Only 2% of our state’s energy comes from renewable sources.
Can you think of a reason why?
Renewable energy sources
Examples of renewable energy
resources are:
 wind power
 solar power
 tidal power
 biomass

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Renewable or non-renewable?

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The Sun
The Sun is the original source
of most energy resources.
Plants store the Sun’s energy
through photosynthesis.
Animals then eat the plants.
Energy and the Sun

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coal
wind
biomass
oil
The Sun is
the original source
of most energy
resources.
natural gas
food
Energy resources from the Sun
waves

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7I Energy Resources
Contents
Energy resources
Fossil fuels
Summary activities

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Fossil fuels

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About 300 million years ago, trees
and other plants photosynthesized
and stored the Sun’s energy.
Dead plants fell into swampy water
and the mud prevented them from
rotting away.
How coal was formed
Over the years, the mud piled up and squashed the plant
remains.
After millions of years under this pressure, the mud became
rock and the dead plants became coal.

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Coal formation

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Oil and gas are also biological in origin. Millions of years ago
tiny animals lived in the sea. Like today, their ecosystem was
dependent on heat and light from the Sun and
photosynthesis by plants. When they died they fell into mud
and sand at the bottom of the sea but did not rot away.
Over millions of years, they got buried deeper by the mud
and sand. The temperature and pressure (caused by the
weight of the sediments and deep burial) changed the
mud and sand into rock and the dead animals into crude
oil and natural gas.
This sample of crude oil was formed in
Europe. Crude oil formed in other parts of
the world can be very different in
appearance and viscosity.
How oil and gas were formed

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Oil and gas formation

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7I Energy Resources
Contents
Energy resources
Fossil fuels
Summary activities

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Glossary
 energy – The ability to do work – it exists in different forms
such as chemical, electrical, heat and light.
 energy transfer – Changing energy from one form to
another.
 energy resource – A substance that is a source of energy.
 fuel – A substance that releases energy when it burns.
 fossil fuel – A fuel that is formed from the remains of dead
plants and animals, such as coal, oil and natural gas.
 non-renewable – An energy resource that cannot be
replaced and will eventually run out.
 renewable – An energy resource that can be replaced and
will not run out.

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Anagrams

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Multiple-choice quiz

Intro to Energy Notes.ppt

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