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Energy and power part IIPowerPoint Presentation

Energy and power part II

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### Energy and powerpart II

- 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

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

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

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

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…

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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