7-3 Renewable energy

See Ya! Fossil fuels could be gone in 200 years Safety concerns with nuclear energy Renewable energy – can be replaced in a human life span

Geothermal Energy Energy from the Earth's interior Magma Steam and hot water – heat Steam to turn turbine

Solar Energy Energy from the Sun’s radiation Every 15 minutes the Earth gets enough energy from the Sun to energy needs for a year How to capture it?

Passive Systems No moving parts Windows facing the Sun

Active Systems Solar collectors Water circulates through tubes in box Photovoltaic cell– solar energy directly into electricity Small amounts

Moving Water Hydroelectric – electricity from moving water Dams Tides 11% of energy in US Dams Tides Rivers

Biomass Plant material Manure Organic Matter Burned to generate energy Developing Countries

Wind Energy Wind turbines to generate electricity Wind – air pressure differences from heating Wind farms