1. Alternate Energy Sources Chapter 4.2 At the present rate of consumption of fossil fuels, we will run out in 170 years.

2. Solar Energy Free fuel and non-polluting Free fuel and non-polluting Solar panels (collectors) Solar panels (collectors) + Heat air in homes, water + Energy can be collected and converted to electricity – Note always available (cloudy days/night)

4. Nuclear Energy Radioactive materials that release energy through nuclear fusion Radioactive materials that release energy through nuclear fusion + Uranium (heavy atom) nuclei split releasing energy (chain reaction) – Cost, safety, disposal

6. Wind Energy Harness kinetic energy in wind and convert it to electricity Harness kinetic energy in wind and convert it to electricity

7. Hydroelectric Power The power that falling water generates drives turbines to produce electricity The power that falling water generates drives turbines to produce electricity –5% of electricity in U.S. –Potential energy (stored) → Kinetic energy (motion)

8. Geothermal Energy Tapping into natural underground reservoirs of steam and hot water Tapping into natural underground reservoirs of steam and hot water –Heating –Electricity

9. Tidal Power Energy harnessed by constructing a dam across the mouth of a bay or estuary Energy harnessed by constructing a dam across the mouth of a bay or estuary –In and out flow = energy