Topic 8 - Energy Production

Question 1

Energy Density

Answer 1

energy/mass

Question 2

Specific Energy

Answer 2

energy/volume

Question 3

Primary Energy Sources

Answer 3

Energy sources used directly by someone

• Coal (heat house)
• Oil
• Water
• Wind (wheat mill)

Question 4

Secondary Energy Sources

Answer 4

• Hydrogen
• Electricity

Question 5

Nuclear Fission Process

Answer 5

4 main parts
Control Rods
* they control the rate of reaction by absorbing neutrons
Moderator
* Slows down fast neutrons (1-2MeV -> 0.02MeV)
Heat Exchanger
* Heat from really hot rod room circulated and heats up water for steam adn turbine
Fuel Rods
* Actual U-238 rods

Energy is mostly kinetic, some heat

Question 6

Wind Turbines

Answer 6

Wind happens because of convection current (specific heat)

power = 1/2 * A * row * v^3 (from KE=1/2mv^2)

Question 7

HydroElectric

Answer 7

sun driven or moon driven

tidal barrage wind turbine spins both ways, twice a day

Question 8

solar

Answer 8

solar panels : heat water

photovoltaic cells : electricity
crystal silicone with phosphorus and boron

Question 9

albedo

Answer 9

the percent of light reflected
albedo = P(scatter)/P(incident)

Question 10

3 ways molecules can gain kinetic energy

Answer 10

translation (movement)
rotation (spin)
vibration

Question 11

list the greenhouse gasses

Answer 11

• methane (CH4)
• water vapor (H2O)
• carbon dioxide (CO2)
• nitrous oxide (N2O)

Question 12

what is : a black body

Answer 12

solid absorbing all wavelengths