ch 8 back- Spring 2006 - Sparks

ch 8 back- Spring 2006 - Sparks - 1 Galvanic Cells chemical...

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Unformatted text preview: 1. Galvanic Cells: chemical to electrical energy (using battery to power devices) a. Electron transfer (LEO goes GER) ex: Alkaline batt, Mercury, Li ion, NiCad, Lead 2. Electrodes: electrical conductors in cell; site of chemical reactions a. Anode: Oxidations occur & Cathode: Reduction occur 3. Electricity : flow of electrons Current : rate of electron flow (speed) Dead battery : no e- flow & 0 voltage 4. Voltage: difference in potential b/w the electrodes a. Higher voltage = more E associated w/ transfer, cells can be connected to increase voltage 5. Considerations in designing battery: environment effect, cost, long lasting, rechargeable, safety a. Battery Efficiency: 90% compare to 30-40% power plants: extra cost is disposal cost b. Lithium-iodine batteries i. Very light due to low LI density, Reliable & long lived, Used for pacemakers & last up to 10 yrs c. Mercury batteries i. Very small, but disposal hazard ii. Phased out bc Battery Act of 1996 (Mercury-Containing and Rechargeable Battery Management Act) d. Lead Storage batteries i. Car batteries, Lead is both oxidized and reduced, Rechargeable & long lasting...
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