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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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A MWh is a unit of:

  • Charge

  • Energy

  • Current

  • Power

  • Cost


Cost of energy
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 energy1
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!




Power
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


Power1
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




Fossils
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


Extra clickers
Extra clickers…

Didn’t get to these 31 Aug 2010


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


  • 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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