Presentation on theme: "Electricity & Magnetism at Work"— Presentation transcript:
1 Electricity & Magnetism at Work BatteriesChapter 3Section 4
2 BatteryConverts Chemical energy to electrical energy
3 Luigi Galvani1700’sItalianWas using a brass hook to dissect a frogWhen the hook touch an iron railing it made the frogs leg jumpElectron flow!
4 Alessandro Volta 1800 Stacked Silver (Ag) and Zinc (Zn) metal plate ItalianDesigned 1st batteryStacked Silver (Ag) and Zinc (Zn) metal plateSeparated by a paper that had been soaked in salt water
5 Electrochemical Cells A devise that converts chemical energy into electrical energyElectrodesMade of two different metalsElectrolyteSubstance that conducts electricitySalt waterAcid
6 A Simple CellChemical reaction occurs between the electrolyte and the electrodes in the electrochemical cell.These reactions cause one electrode to become negatively charged and the other to become positively charged.
7 Combining Electrochemical Cells If 2 or more electrochemical cells are connected in series, the “+” terminal of one is connected to the “-” terminal of the next.The voltage of the battery is the sum of the cells.
8 Wet Cells Wet Cells 12-V car Battery Use liquid electrolytes AcidsSalt water12-V car BatterySulfuric acid6 cells
9 Dry Cells Dry Cells Duracell Use paste electrolytes Zinc can with a carbon rod down the middle
10 Dead BatteriesThe battery will continue to produce a current until the electrodes and/or the electrolyte are used up
11 Rechargeable Batteries Nickle-Cadmium cellsLaptopsCell phonesiPodsSome chemical reactions can be reversedRecharges the battery
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