Presentation on theme: "Electricity & Magnetism at Work"— Presentation transcript:
1Electricity & Magnetism at Work BatteriesChapter 3Section 4
2BatteryConverts Chemical energy to electrical energy
3Luigi Galvani1700’sItalianWas using a brass hook to dissect a frogWhen the hook touch an iron railing it made the frogs leg jumpElectron flow!
4Alessandro 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
5Electrochemical Cells A devise that converts chemical energy into electrical energyElectrodesMade of two different metalsElectrolyteSubstance that conducts electricitySalt waterAcid
6A 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.
7Combining 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.
8Wet Cells Wet Cells 12-V car Battery Use liquid electrolytes AcidsSalt water12-V car BatterySulfuric acid6 cells
9Dry Cells Dry Cells Duracell Use paste electrolytes Zinc can with a carbon rod down the middle
10Dead BatteriesThe battery will continue to produce a current until the electrodes and/or the electrolyte are used up
11Rechargeable Batteries Nickle-Cadmium cellsLaptopsCell phonesiPodsSome chemical reactions can be reversedRecharges the battery