Ch 15 Sec 3
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Transcript of Ch 15 Sec 3
CH 15 Sec 3
Energy Resources
Natural Resources
• Needs that are provided by nature• 2 types
–Renewable – nature replaces or replenishes them
• Solar, wind, hydro
–Nonrenewable – limited supply• Oil, coal
Renewable Energy sources
• Water – Hydroelectric, rivers, waterfalls, dams (need to be near
water)
Renewable Energy sources
• Geothermal – heat from the earth (need to be near
hotspots)
Renewable Energy sources
• Solar – energy from the suns rays (capture, clouds, night)
Renewable Energy sources
• Wind – Wind energy pushes turbines (need many
turbines for a little energy, consistently windy areas)
Other renewable resources
• Biomass – chemical energy stored in living things
• Hydrogen fuel cell – creates energy by reacting hydrogen and oxygen
Nonrenewable energy sources
• Oil, coal, natural gas
• Likely to run out in our lifetime
• Creates pollution
Air Pollution
Fossil Fuels
Nonrenewable energy sources
• Nuclear Energy• Create heat by
splitting Uranium atoms
• + clean, cheap, efficient
• - dangerous, uranium is limited, but plentiful
Conserving Energy Resources
• Reduce energy needs and increasing energy efficiency
• Problems – convenience and initial cost