Daily Review #2 5. Which of your marshmallow ovens worked the best? Why? Make sure you include in your description the science of why it was the best.

Photovoltaics Video Movement of electrons Where? – Buildings – Farms Farms – Space Cost

Wind  What is wind?  How is it used?  Wind turbines  Spin blades  Turn turbine  Spin coil in a magnet/generator  Where is it used?  Individually  Farms  Water  Electricity

Photovoltaics Advantages (Pros) Disadvantages (Cons)  EES – 2 EES – 2  EES – 3 EES – 3  EES – 4 EES – 4  EES – 5 EES – 5  EES – 8 EES – 8

Wind Advantages (Pros) Disadvantages (Cons)  EES – 2 EES – 2  EES – 3 EES – 3  EES – 4 EES – 4  EES – 5 EES – 5  EES – 8 EES – 8

Biofuels  Plant or animal material  3 types  Biomass  Wood, yard waste,  Methane from landfills, feedlots  Burned and used to create steam  electricity  Biodiesel  From: vegetable oils or algae  Byproduct: Glycerin  Pure or mixed  Produces less energy than diesel  Decreased emissions  Storage

Ethanol  Corn or sugar cane  Created  Mixed with water and enzymes  Heated/cooked  Liquid = ethanol  Solids = animal feed  Used in vehicles  Mixed with gasoline  Pure  Efficiency – compared to gas  Uses less energy to produce  Can produce less energy when burned  Decreased emissions