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P120_2008_week_12

# P120_2008_week_12 - Possible topics for last 2 weeks(votes...

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Possible topics for last 2 weeks (votes on first day of class) (1 point for first, 2 for second etc.) Hydrogen economy (128) Nuclear Power (fission/fusion) (137) Fuel Cells (154); I’ll include this in with Hydrogen economy discussion. Unconventional Fossil (189) Won’t cover this. Other suggestions now??

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Electric Circuit basics V= I*R R is measured in OHMS ( ) 1 = 1V/1A R = ρ l/A ρ : resistivity (e.g. Cu 1.69x10 -8 m; Al 2.75x10 -8 m) l length of the wire A cross-sectional area of the wire P= I*V
Series and Parallel Circuits Series circuit: Current is the same in all elements (voltages add) Parallel circuit: Voltage is the same in all elements (Currents add)

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The other side of the circuit Need a source of EMF to “lift” the electrons up the potential energy hill in the power source: Batteries, Fuel Cells (chemical) Generators (electro-magnetic) Solar (photo-electric effect)
Batteries All batteries have the same basic principle, but the chemical reactions and The materials used for the electrodes and electrolytes) differ. This gives Different voltages, internal resistances, masses, operating temps, etc. H&K p 327

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Batteries: Energy Density http://www.hardingenergy.com/pdfs/ComparisonofApplication.pdf (as of Jan. 2004, note on this scale, gasoline is 12000 Wh/kg and 9500 Wh/l) Compare these numbers to table 10.1 in the text.

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P120_2008_week_12 - Possible topics for last 2 weeks(votes...

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