140 likes | 252 Views
Energy supply. Energiförsörjning. World energy supply and demand. Energy sources. Almost all the energy we use originates from the sun . The energy reaches us on earth via radiation .
E N D
Energy supply Energiförsörjning
Energy sources • Almost all the energyweuseoriginates from the sun. • The energyreachesus on earth via radiation. • The onlyenergysourcesthatare not connectedto the sunare:- Nuclearpower.- Earth heat.
Bio-fuels • Fuelthatcomes from living organisms. • Firewood, charcoal, peat, halm, energygrass.
Hydropower • To be abletousewater as power source, inland watershaveto be largeenough and landscape haveto be hilly. • Hydropower plants produce about 24 % of the world's electricity.
Oil • Biggestenergy source in the world. • Producesabout 35 % ofenergy in the world. • Raw material for petrol, lighter fluid, kerosene and plastics.
Gas • Usedto make electricity, as fuel for buses, and as industrialenergy source. • Gas reserveswillrunout in 60 years.
Coal • Second biggestenergy source in the world. • Coalreserveswillrunout in a coupleofhundredsofyears.
Nuclearpower • In 2012, therewere439 nuclear power plants in operation in the world. • New power plants built in Asia. • In Europe and Asia opposite trend.
Windpower • In 2010 wind energy production counted for about 2.5% of total worldwide electricity.
Waveenergy • Makinguseof the motion energy from waves. • Wave farms
Geothermalenergy • Not connectedto the sun. • Makinguseof the internal heat of the globe.
Solar energy • A direct form ofenergy.