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# Energy and power part II - PowerPoint PPT Presentation

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 powerpart II

• Charge

• Energy

• Current

• Power

• Cost

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

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!

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

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

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

Didn’t get to these 31 Aug 2010

• 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.”