2 Nonrenewable Energy Resources Exist in limited in quantities and once used cannot be replaced except over the course of millions of yearsNonrenewable resources include oil, natural gas, coal and uranium (fossil fuels)
3 Fossil fuelsFossil fuels - formed underground from the remains of once-living organisms.Are the majority of the world’s energy sourceAre NOT found everywhere
4 Fossil Fuels The US provides: 2 % of the world’s oil supply 25% of the world’s coal supplyGood thingsRelatively inexpensiveUsually readily availableBad thingsTheir use creates pollutionWe don’t have much in the US
5 Renewable Energy Resources Resources that can be replaced in a relatively short time period of timeMOST originate directly or indirectly from the sun.Renewable energy resources include hydroelectric, solar, geothermal, wind, biomass, and possibly in the future nuclear fusion.
6 Renewable Energy Resources Include:HydroelectricSolarGeothermalWindBiomassNuclear Fusion(possibly in the future)
7 Hydroelectric Energy Energy obtained from flowing water As water flows downhill, its GPE is converted into KE.The KE is used to turn turbines connected to electric generatorsGood thingsLow cost to produce and lack of pollutionSome bad thingsUse dams which blocks the flow of water and cause a variety of environmental problemsHamper the run of fish upriver for spawning
8 Hydroelectric power plants Some used as water flows naturally down hillSome use dams to build and hold back the water to create energy
11 Sunlight converted into usable energy Solar EnergySunlight converted into usable energyPassive Solar: like light going through the window
12 Sun converted into electrical energy through solar cells Active Solar:Sun heats flat collection plates through which water flows, this water used for your water heaterSun converted into electrical energy through solar cells
13 Does not pollute but not found everywhere Geothermal EnergyThermal energy found under the earth’s surfacePump water underground to create steam which in turn moves the generators to produce electricityDoes not pollute but not found everywhere
15 Biomass Energy: Energy stored in living things Use wood, corn stalks (the stuff thrown away), and convert into thermal energyUse to create bio fuel - a high- energy alcohol fuel
16 OthersHydrogen fuel cell: generates energy by reacting hydrogen with oxygenWaste product would be water so it’s nonpollutingNuclear Fusion: still being worked on today but would probably produce little pollution or radioactive wasteWind turbines: convert the kinetic energy in the horizontal movement of wind into rotational energy of the turbines rotator shaft. Rotational energy is then converted into electrical energy by an electric generator.Clean and wind is everywhere but takes up a lot of space
17 Conserving Energy Resources Energy resources can be conserved by reducing energy needs and increasing efficiency of energy useFinding ways to use less energy or to use energy more efficiently is known as energy conservationEnergy Saving Decisions: turn off lights, carpool, change the light bulbs, etc.