P18_circuits(1)

P18_circuits(1) - Batteries The Electric Battery A battery...

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Unformatted text preview: Batteries The Electric Battery A battery transforms chemical energy into electrical energy . Chemical reactions within the cell create a potential difference between the terminals This potential difference can be maintained even if a current is kept flowing. + terminal- terminal Red-Ox reaction Copper (Cu) binds its electrons stronger than iron (Fe). We can release energy by moving electrons from iron to copper. Voltage = Energy / charge The interior of a battery (appendix AA-66) Battery capacity The capacity of a battery is measured in Ampere hours (A h) 1 A h = 1 A * 3600 sec = 3600 Coulomb i.e. this is a measurement of charge The stored energy is also depends on the battery voltage Energy = Voltage * charge Example A battery is labeled 10 A h, 10V. What energy can the battery store? A) 100 J B) 100 V*A C) 36 kJ D) 18 kJ Batteries in series 1.5 V 3 V 1.5 V Like two escalators one above the other. This doubles the height of the escalator. Batteries in parallel 1.5 V 1.5 V Like two escalators in parallel, they cover the same height, but increase the capacity. Using batteries You have several of the depicted NiMH AA batteries (1.25V). Your device requires 2.5V. Additionally a battery capacity of 5Ah is recommended to ensure the desired operational lifetime. Which battery configuration do you choose? A) B) C) D) E) Batteries and Capacitors Batteries can store much more energy than capacitors of the same size. But capacitors can release the energy much quicker . Batteries are limited by the speed of the chemical reaction. E.g camera flash uses capacitors, charged by batteries Example problem A 1 F capacitor is charged with a 9V battery. Then a switch is thrown and the capacitor is discharged through a resistor....
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This note was uploaded on 02/15/2012 for the course PHYSICS 200 taught by Professor Staff during the Fall '11 term at Syracuse.

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P18_circuits(1) - Batteries The Electric Battery A battery...

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