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Energy and power part II

Energy and power part II. prefixes. A MWh is a unit of: Charge Energy Current Power Cost. Cost of energy. I burn 2000 light bulbs for 10 hours. How much does this cost? ($0.10/kWh) A) $0.20 B) $2.00 C) $20.00 D) $200.00 E) $2000.00. Cost of energy.

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Energy and power part II

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  1. Energy and powerpart II

  2. prefixes

  3. A MWh is a unit of: • Charge • Energy • Current • Power • Cost

  4. Cost of energy I burn 2000 light bulbs for 10 hours. How much does this cost? ($0.10/kWh) A) $0.20 B) $2.00 C) $20.00 D) $200.00 E) $2000.00

  5. Cost of energy I burn 2000 light bulbs for 10 hours. How much does this cost? ($0.10/kWh) A) $0.20 B) $2.00 C) $20.00 D) $200.00 E) $2000.00 Flourescent lights = about 4x more efficient! That’s why CU uses flourescent lights instead of incandescent bulbs!

  6. Cost of electricity

  7. Energy units

  8. Power Is a MegaWatt a lot? • A horse can output about a MW • A Ferrari could output a MW at peak acceleration • That’s about the entire power output of the sun • A nuclear power plant produces about a MW

  9. Power Is a MegaWatt a lot? • A horse can output about a MW – 1 kW is about a hp (+34%) • A Ferrari could output a MW at peak acceleration – 750 kW max… • That’s about the entire power output of the sun – 173,000 TW hits the earth • A nuclear power plant produces about a MW – about a GW

  10. Power examples

  11. Solar power

  12. Fossils Levels (amount in ground): Coal: 4.4 Tboe Oil: 1.2 Tboe Natural gas: 1.2 Tboe Flows (daily production): Coal: 52 Mboe/day Oil: 84 Mboe/day Natural gas: 19 Mboe/day Years of production left (using current #s  most optimistic): Coal: 231  417 years Oil: 39  43 years Natural gas: 173  167 years In 2008, the U.S. energy use was: 84% fossils 9% Nuclear 7% Renewables

  13. Extra clickers… Didn’t get to these 31 Aug 2010

  14. In Chapter 1, “smart rock” refers to: • a kind of low-calorie food • the asteroid that killed the dinosaurs • a method for shooting down missiles • uranium ore

  15. A disadvantage of hydrogen fuel is that: • it contains less energy per pound than gasoline. • it cannot be made into a liquid, even at low temperature. • it is highly poisonous and corrosive. • it can’t be mined, but must be “manufactured.”

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