2Where does our energy come from for…? Electric lightMobile phonesPower for your mp3TVHot Water
3Energy for these things come from Energy Resources, that are converted into energy that we can easily use.Electricity is the main form of energy that we use and can power or charge what we need energy for.
4To generate electricity… You need an energy source, e.g. coalThis is burnt to produce heat or steamThe heat or steam then drives a turbineThe turbine then can drive a generatorThe generator then produces electricityThe electricity is then transported in cables to where it is needed
6Energy Resources can be divided into 2 categories: Non-Renewable ResourcesFor example – coal, oil, gas, uranium or ligniteOnce used these resources CANNOT be used again2. Renewable ResourcesFor example – wind, water or solarThese resources can be used over and over again
7Non-Renewable Resources: COAL What is it?Formed underground from decaying plant materialHow much left in the world?About 200 yearsAdvantages?Plenty leftMining is getting more efficientDisadvantages?Pollution: CO2 emissions (linked to global warming), SO2 (linked to acid rain)Heavy & bulky to transport
8Non-Renewable Resources: OIL What is it?Formed underground from decaying animal and plant materialHow much left in the world?About 40 years!Advantages?Quite easy to transportEfficient in producing energyLess pollution than coalDisadvantages?Not much leftPollution: air and danger of water pollution through spills
9Non-Renewable Resources: NATURAL GAS What is it?Formed underground from decaying animal and plant materialHow much left in the world?About 60 yearsAdvantages?Clean, least polluting of all non-renewablesEasy to transportDisadvantages?Some air pollutionDanger of explosions
10Non-Renewable Resources: NUCLEAR What is it?Uses uranium, naturally found in some rocksHow much left in the world?Not knownAdvantages?Not much waste and few CO2 emissions released, as well as, few other greenhouse gasesDisadvantages?High cost to build and close down power stations.Waste is radioactive. Problem with getting rid of waste safely
11Coal in Three Stages: Lignite peat is compressed to about one-fifth of its original thicknesslowest heating valueBituminousformed under more heat and pressure than ligniteAnthracitehighest heating valuecomes from highest pressure compression and temperaturescleanest burning of all the coals
12Why is the term, FOSSIL FUEL used for coal, oil, gas and lignite?
13Renewable Resources: WIND What is it? It the movement of air from high to low pressureHow much left? EndlessAdvantages? No pollutionDisadvantages? Winds change all thetime, not predictable
14Renewable Resources: SOLAR What is it? Energy from the sunHow much left? EndlessAdvantages? No pollution, can be used in remote areasDisadvantages? Can be expensive, needs sunlightAt night it doesn’t work
15Renewable Resources: BIO-ENERGY What is it? Biomass and Biogas –fermented animal or plant wastevegetation from sustainable sourcesHow much left? EndlessAdvantages? Good availabilityDisadvantages? Can be expensive to set up
16Renewable Resources: HYDRO What is it? Movement of water drives a turbineHow much left? EndlessAdvantages? No CO2 emissions, can control flooding and provide a good water supply to an areaDisadvantages? Large areas maybe flooded. Visual and water pollution
17Renewable Resources: GEOTHERMAL What is it? Heat from the ground – often used to heat waterHow much left? A lotAdvantages? No CO2 emissionsDisadvantages? Expensive and can only be used in certain parts of the world
18Renewable Resources: WATER & TIDAL What is it? Movement of sea drives turbinesHow much left? EndlessAdvantages? Can produce a lot of electricity, no CO2 emissionsDisadvantages? Not many suitable sites