1. Conserving Energy in the Home
Chapter 25-4

2. Energy Sources Nonrenewable Energy Sources Renewable Energy sources
Energy that cannot be replaced
Fossil fuels – oil, natural gas, coal, uranium ore - fuels cars, heats homes, makes nuclear power
Renewable Energy sources
Energy that can be replaced
Water, wind, solar, biomass, geothermal

3. Energy Sources Water Wind
Energy of falling water converted to hydroelectric energy
Rain makes this a renewable source
Wind
14 mph wind speed needed to convert to electricity
Fastest growing energy technology

4. Energy Sources Solar Energy
Greatest renewable source but relatively expensive
Solar collectors absorb sun providing hot water or space heating for homes
Special reflectors focus sunlight into fiber optic system to light interiors of buildings

5. Energy Sources Biomass
Energy stored in dry, decayed plant and animal matter
When burned, produces heat and steam which can be converted to electricity
Wood once used in fireplaces to produce all energy for heating and cooking
Crops like corn and sugar are fermented to produce transportation fuel called ethanol

6. Energy Sources Biodiesel made from oil extracted from soybeans
In limited supply but a fast growing technology
Solid waste is biomass that rots - like food and lawn clippings
Americans create 4.4 pounds of trash daily of which over a pound is biomass
Burning it generates steam and an ash by-product used for roads
Waste placed in landfills release a gas that can be converted to a fuel source

7. Energy Sources Geothermal Energy
Derived from heat produced within the earth
Only possible in certain geographic locations where it is collected as steam to generate electricity
Greater application used for heating and cooling homes

8. Conserving Energy In Your Home
About 56% of energy used for heating and cooling, water heater 16%, lighting & appliances 28%
Control indoor temperature, seal air leaks, use window coverings
Increase home’s insulation, install energy efficient windows, buy energy efficient appliances, use a programmable thermostat, landscape wisely (see chart in text pg 671)