1. Generating Electrical Energy
Energy isn’t created or destroyed, so how can we “get” electricity?

2. Generators turns mechanical energy into electrical energy

3. Cells – change chemical or radiant energy into electrical energy

4. Parts of a Cell
Electrolyte and Electrodes

5. Electrolyte
mixture of chemicals that allow electrons to flow

6. Electrode
pair of conductors through which electrons enter and exit

7. What makes it work?
Chemical changes between the electrolyte and the electrodes convert chemical energy into electrical energy

8. Two kinds of cells:
Wet Cells Dry Cells

9. Wet Cells – have liquid electrolytes
Example: car battery

10. Leaking Battery Acid

11. Dry Cells – have solid or paste-like electrolytes
Example: camera batteries

12. Thermocouple
A device that converts thermal energy into electrical energy

13. Thermocouple
The greater the temperature difference, the greater the current
Not much energy, but help monitor temp. of engines and furnaces

14. Photocells
A device that converts light energy into electrical energy

15. Photocells

16. New Trends