1. BATTERIES

2. LEMON POWER!!! Watch the demonstration!!!

3. THE FIRST BATTERY Research that lead to the development of the battery was AN ACCIDENT! 1780’s Luigi Galvani Studying a frog. Brass hook to hold the leg in place Other end of hook touched an iron railing The leg twitched! “Animal Electricity”

4. THE FIRST BATTERY Alessandro Volta Argued the electrical effect was from a chemical reaction! Chemical Reaction A process which substances change into new substances with different properties. Layered Zinc, Paper soaked in saltwater, and silver. Chemical energy Energy stored in chemical compounds

5. ELECTROCHEMICAL CELLS Electrochemical cell A device that transforms chemical energy into electrical energy Consists of… Two different metal electrodes Immersed in a substance called an electrolyte (It conducts the current)

6. WET CELL Wet cell Electrochemical cell where the electrolyte is a liquid

7. DRY CELL Dry cell Electrochemical cell where the electrolyte is a paste

8. BACK TO THE LEMON… How does the lemon power the clock? What kind of battery is it?

9. AS THE OLD SAYING GOES…

10. REVIEW Luigi Galvani stumbled across the concept that lead to the battery when he… 1.Was discussing Animal Electricity with some fellow scientists. 2.Was dissecting a frog. 3.Scooting across the carpet in wool socks. 4.None of the above.

11. REVIEW Alessandro Volta built the first battery by… 1.Tying a piece of metal to a flying kite during a thunderstorm. 2.Placing a crank on a machine that turns a magnet creating a circuit. 3.Layering zinc, paper soaked with salt water, and silver. 4.None of the above.

12. REVIEW A wet cell is… 1.An electrochemical device that uses a liquid for the electrode. 2.An electrochemical device that uses a paste for the electrode. 3.An electrochemical device that uses a liquid for the electrolyte. 4.An electrochemical device that uses a paste for the electrolyte.

13. REVIEW A dry cell is… 1.An electrochemical device that uses a liquid for the electrode. 2.An electrochemical device that uses a paste for the electrode. 3.An electrochemical device that uses a liquid for the electrolyte. 4.An electrochemical device that uses a paste for the electrolyte.