Alternative Alternative Energy SourcesEnergy Sources

Ch. 6Ch. 6

Europe is the only continent without a desert

Renewable Energy Sources are replaced in nature almost as fast as they are used up.

•Examples: water power, wind power, solar energy, geothermal energy

Energy Information Administration Energy Information Administration (EIA) estimated that in 2013 about (EIA) estimated that in 2013 about

10% of world marketed energy 10% of world marketed energy consumption is from renewable consumption is from renewable

energy sources.energy sources.

EIA also estimated that in 2013 EIA also estimated that in 2013 about 19% of world electricity about 19% of world electricity generation was from renewable generation was from renewable

energyenergy

Water PowerWater Power Major use of water Major use of water

power is to create power is to create electricity-called electricity-called hydroelectric power hydroelectric power (hydro=water)(hydro=water)

Positive:Positive: Most Most efficient way to efficient way to produce electricity. produce electricity. Turbine blades turned Turbine blades turned directly by the water.directly by the water.

•Can only be used where rivers can be dammed. Can only be used where rivers can be dammed. •Only 8% of U.S. electricity comes from water.Only 8% of U.S. electricity comes from water.

Wind PowerWind Power Wind Mills convert wind to energy. Wind Mills convert wind to energy. Used in areas where the wind is strong and Used in areas where the wind is strong and

consistent. consistent. Disadvantages:Disadvantages: Wind is inconsistent, noisy, Wind is inconsistent, noisy,

and can interfere with television and radio and can interfere with television and radio reception. Problems with storing the energy reception. Problems with storing the energy produced for later use. produced for later use.

Solar PowerSolar Power Solar energy uses the sun to produce heat Solar energy uses the sun to produce heat

and electricity. and electricity.

Solar cellsSolar cells – convert sunlight into – convert sunlight into electricity. electricity.

Disadvantage: Disadvantage: Large area needed for Large area needed for the panels, sun is inconsistent year the panels, sun is inconsistent year round.round.

Geothermal Energy:Geothermal Energy: Geothermal energy uses heat Geothermal energy uses heat from rocks rocks

buried deep below earth’s surface to generate buried deep below earth’s surface to generate electricity.electricity.

Heat brought to earth’s surface by steam or Heat brought to earth’s surface by steam or hot water.hot water.

Earth's geothermal energy originates (20%) from the

original formation of the planet and (80%) from

radioactive decay of minerals.

In 2010, the United States led the world in geothermal electricity.The largest group of geothermal

power plants is located in California.

Geothermal power makes up approximately 18% of the

country's electricity generation.

Largest geothermal power plant in the world is Largest geothermal power plant in the world is located in California and is called the “Geysers”.located in California and is called the “Geysers”.

AdvantagesAdvantages – no fuel needed, gives off very little – no fuel needed, gives off very little pollutionpollution

DisadvantagesDisadvantages – far from populated areas, expensive, – far from populated areas, expensive, and hot water taken out must be returned to ground to and hot water taken out must be returned to ground to prevent collapse of ground. prevent collapse of ground.

Two convicts are locked in a cell. There is an unbarred window high up in the cell. No matter if they stand on the bed

or one on top of the other they can't reach the window to escape. They then

decide to tunnel out. However, they give up with the tunneling because it will

take too long. Finally one of the convicts figures out how to escape from the cell.

What is his plan?