RENEWABLE AND ALTERNATIVE ENERGY SOURCESMs. Marcino

Environmental Science

Chapter 17 (pgs. 264-283)

Renewable Energy Today

Renewable Energy: _________________________

___________________________________________ Include:

Even renewable energy

Solar Energy

Solar energy:

Medium-sized _______ Radiates energy

High temperatures cause hydrogen nuclei to fuse, forming helium nuclei and a loss of mass occurs. Lost mass converted to heat and light energy.

Only little bit (___________) of All Energy reaches us as

Pros

Cons

Passive Solar Heating Passive solar heating:

Not used Example:

Energy enters Heat

Buildings must be

Oriented

Passive Solar Features:

Active Solar Heating

Active solar heating:

Solar Liquid Hot liquid pumped through

Photovoltaic cells:

Produce little electrical current,

Energy production from solar cells has doubled every 4 years from 1985.

Wind Power-Cheap and Abundant Wind:

Wind power:

Wind turbines are cost effective and can by constructed quickly.

Aerogenerators:

Wind Farms

Wind farms: Take up little space. Land can still be used for farming.

Biomass-Power from Living Things Biomass Fuel:

Ex:

Used for Renewable Careful-

Methane

Alcohol

Hydroelectricity-Power from Moving Water

Hydroelectric energy:

Dam across Water Motion of turbine

Benefits:

Disadvantages:

Modern Trends Micro-hydropower:

Energy from the Tides Generate electricity similarly to how

generated in river. Turbine must be able to turn in BOTH

directions.

Geothermal Energy-Power from the Earth

Geothermal Energy:

Geothermal heat pump:

Enough heat present in the earth to melt rock. Magma:

When it

Alternative Energy and Conservation

Alternative energy:

To become viable,

Tidal Power Movement of water in oceans caused by

gravitational attraction between the Marked by As tide rises,

Ocean Thermal Energy Conversion (_______) Warm surface water is used to boil sea

water in a vacuum chamber.

Pumping the water

Hydrogen When burned Current production