1 / 42

Energy and Electricity

Energy and Electricity. ES 303. The lifetime of a resource depends on…. How much we have How fast we use it. What resources does the US have?. Fossil fuels = Oil Coal Natural Gas Why are we depleting our resources (running out)? http://www.npr.org/news/specials/climate/video/.

lakia
Download Presentation

Energy and Electricity

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Energy and Electricity ES 303

  2. The lifetime of a resource depends on… • How much we have • How fast we use it

  3. What resources does the US have? • Fossil fuels = • Oil • Coal • Natural Gas • Why are we depleting our resources (running out)? • http://www.npr.org/news/specials/climate/video/

  4. Energy is… • The ability to do work. IMPORTANT ENERGY CONCEPTS • Energy is neither created or destroyed. • Energy is lost as heat as it gets transferred or changes form.

  5. Renewable Energy Hydroelectric Wind Solar Biofuels Hydrogen fuel cell Geothermal Nonrenewable Energy Oil Coal Natural gas Energy Resources

  6. What is energy used for? Manufacturing Transportation Heating Electricity

  7. Can you make it work? • What is causing the ball to light up? • Where is the power coming from?

  8. Can you light the lightbulb? • Make a circuit = energy CIRCLE

  9. Electricity • The movement of electrons. • Created by moving wires (electrons) through a magnetic field.

  10. Energy is needed to make electricity • Where does the supply of electrons come from? http://www.youtube.com/watch?v=AbUjieMLFSo • Can you list the steps to create electricity?

  11. Electricity Production • Coal/oil/natural gas fired power plants • Burn fossil fuel to make heat. • Heat boils water to make steam. • High pressured steam turns a turbine. • Moving turbine turns the generator (magnets and wires). • The magnet creates a flow of electrons = Electricity! • Moving electrons sent through wires to houses, schools, etc. • Can you order the pictures correctly?

  12. Turbine and Generator

  13. What is a watt? • 1 watt = energy to lift 100 g (or 1 Newton) in 1.0 seconds. • It is a measure of energy over time • 1 kWh = one kilowatt of electricity over 1 hour

  14. Energy Efficiency • Amount of energy that gets converted to useful energy.

  15. What’s the difference?

  16. Light bulb or heat bulb?

  17. Two sides to everything. http://www.mnn.com/earth-matters/translating-uncle-sam/stories/cfl-vs-incandescent-battle-of-the-bulb

  18. Byproducts of electrical generation Burning coal Air: Mercury, CO2, SO2, NO2, fly ash Water: thermal pollution, acid rain Ground: bottom ash

  19. Do you have any vampires in your house?

  20. What if I left my computer on every night… How much energy would it consume? Assume 14 hours • In “sleep” mode, the computer draws 4 watts/hour How much would it cost the district per day? Per year? • 1 kWh costs $0.15 What if all computers at the school were left on? Energy consumed? Cost to district? • Around 200 computers at UDHS

  21. How can changing a light bulb reduce greenhouse gases?

  22. 2nd Energy Concept • When energy changes form, some useful energy is always lost as heat. • EX: Only 5-10% of the electricity flowing through an incandescent light bulb is converted to light energy (the rest is heat).

  23. Example of the Matter and Energy Laws Burning Coal = CO2 + SO + H20 + Ash + (CxHxSxOx) Light + Noise + Heat Global Warming Acid Rain Smog

  24. Cartoon: http://www.youtube.com/watch?v=OqVyRa1iuMc

  25. What processes involve the transfer of carbon?

  26. Carbon Cycle Drawing • Make your own, UNIQUE, drawing of the carbon cycle. Include the following: • Photosynthesis, decomposition, respiration, combustion (LABEL ALL) • Include yourself somewhere in the cycle • Point out where humans interfere/alter the carbon cycle

  27. What does this sticker mean?

  28. What can you do?

  29. What is your guess? Fossil fuel power Wind / solar power Nuclear power Hydroelectric power • Out of the energy sources above, which is used the most worldwide? Least? • Guess what percentage each source contributes to the world’s energy supply. • Create a graph.

  30. Energy In ≠ Energy Out

  31. It takes energy to get energy Before it’s useful… Oil must be  Found Pumped Transported Refined Transported burned

  32. Net energy DEFINITION: Total useful energy available from the resource over its lifetime minus the amount of energy used and wasted Example: 10 units of energy in oil in ground Use 8 units to find, extract, process, transport 2 units of net energy available

More Related