Presentation on theme: "Section 15.3: Energy Resources"— Presentation transcript:
1 Section 15.3: Energy Resources Chapter 15: EnergySection 15.3:Energy Resources
2 Nonrenewable Energy Resources These types of resources exist in limited amounts.Cannot be replaced in a reasonable amount of timeExamples:Oil (fossil fuel)Natural Gas (fossil fuel)Coal (fossil fuel)Uranium
3 Renewable Energy Resource Resources that can be replaced in a reasonable amount of timeExamples:Hydroelectric energySolar energyGeothermal energyWindBiomassNuclear fusion (in the future)
4 Hydroelectric Energy Energy obtained from flowing water Advantages Potential energy from downward flowing water changes to kinetic energy.Kinetic energy can be connected to electric generatorsAdvantagesLow cost to produceCauses no pollutionDisadvantagesDams cause environmental concerns.Many of the best places for dams in the U.S. are already being used.
5 Solar Energy Sunlight converted into usable energy Benefits depend on climateDoes not cause pollutionIf the climate lends itself to cloudier weather, then solar energy is not as practical.
6 Geothermal Energy Thermal energy beneath Earth’s surface Found in some regions ~ especially ones close to volcanoesAdvantage: does not cause pollutionBiggest disadvantage: not widely available
7 Other Renewable Resources Biomass energy: chemical energy stored in living thingsCan be converted into thermal energyExamples:burning woodusing corn stalks to produce fuel for carsHydrogen fuel cells: generate electricity by reacting hydrogen with oxygen (produces water)Fusion: likely to produce little pollution or radioactive waste
8 Conserving Energy Resources Energy can be conserved by:reducing energy needsincreasing the efficiency of energy useFinding ways to do these two things is energy conservation.Making products more energy efficient can be expensive at first (a problem for manufacturers) but saves money and energy over time.