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7 i energy resources (boardworks)
1.
KS3 Physics 7I Energy
Resources 1 of 24 20 © Boardworks Ltd 2004 2005
2.
Contents 7I Energy Resources The
nature of energy Energy resources Fossil fuels Summary activities 1 of 24 20 2 © Boardworks Ltd 2004 2005
3.
Different types of
energy There are many different types of energy: thermal light sound elastic gravitational kinetic electrical chemical nuclear 1 of 24 20 3 Can you think of examples of each type of energy? © Boardworks Ltd 2004 2005
4.
Which type of
energy? 1 of 24 20 4 © Boardworks Ltd 2004 2005
5.
Energy transfer 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. Gravitational energy in a ball is converted to kinetic energy when it falls to the ground. What other energy transfers can you think of? 1 of 24 20 5 © Boardworks Ltd 2004 2005
6.
What is the
energy transfer? What energy transfer takes place in each device? 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. 1 of 24 20 6 © Boardworks Ltd 2004 2005
7.
Contents 7I Energy Resources The
nature of energy Energy resources Fossil fuels Summary activities 1 of 24 20 7 © Boardworks Ltd 2004 2005
8.
Using energy 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? 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. Where does the energy for these type of activities come from? 1 of 24 20 8 © Boardworks Ltd 2004 2005
9.
Energy resources in
the UK Energy resources can be divided into two types: renewable (e.g. hydroelectric); non-renewable (e.g. coal, oil, nuclear and natural gas). 32% 41% 2% 1 of 24 20 9 8% gas oil coal nuclear renewables 17% © Boardworks Ltd 2004 2005
10.
Non-renewable energy resources Oil,
coal and natural gas are examples of fossil fuels. They were formed from biological deposits over the course of millions of years. oil coal natural gas 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. 1 of 20 10 of 24 © Boardworks Ltd 2004 2005
11.
Renewable energy sources Renewable
energy resources will not run out because they can easily be regenerated. Examples of renewable energy resources are: wind power solar power tidal power biomass Only 2% of the UK’s energy comes from renewable sources. Can you think of a reason why? 1 of 20 11 of 24 © Boardworks Ltd 2004 2005
12.
Renewable or non-renewable? 1
of 20 12 of 24 © Boardworks Ltd 2004 2005
13.
Energy and the
Sun 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. 1 of 20 13 of 24 © Boardworks Ltd 2004 2005
14.
Energy resources from
the Sun oil coal The Sun is the original source of most energy resources. biomass food 1 of 20 14 of 24 waves wind natural gas © Boardworks Ltd 2004 2005
15.
Contents 7I Energy Resources The
nature of energy Energy resources Fossil fuels Summary activities 1 of 20 15 of 24 © Boardworks Ltd 2004 2005
16.
Fossil fuels 1 of
20 16 of 24 © Boardworks Ltd 2004 2005
17.
How coal was
formed 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. 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. 1 of 20 17 of 24 © Boardworks Ltd 2004 2005
18.
Coal formation 1 of
20 18 of 24 © Boardworks Ltd 2004 2005
19.
How oil and
gas were formed 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 southern England. Crude oil formed in other parts of the world can be very different in appearance and viscosity. 1 of 20 19 of 24 © Boardworks Ltd 2004 2005
20.
Oil and gas
formation 1 of 20 20 of 24 © Boardworks Ltd 2004 2005
21.
Contents 7I Energy Resources The
nature of energy Energy resources Fossil fuels Summary activities 1 of 20 21 of 24 © Boardworks Ltd 2004 2005
22.
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. 1 of 20 22 of 24 © Boardworks Ltd 2004 2005
23.
Anagrams 1 of 20 23
of 24 © Boardworks Ltd 2004 2005
24.
Multiple-choice quiz 1 of
20 24 of 24 © Boardworks Ltd 2004 2005
Notes de l'éditeur
Data based on the consumption of primary fuels in the UK in 2003 from the dti Digest of UK Energy Statistics 2004. Web reference: http://www.environment-agency.gov.uk/commondata/103196/energy1? referrer=/yourenv/eff/resources_waste/energy/
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