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– 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 – 3 EES – 4 EES – 5 EES – 8

Wind

Advantages (Pros) Disadvantages (Cons)

EES – 2 EES – 3 EES – 4 EES – 5 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