1.Thermoelectric (Heat → Electric Energy)
2. Geothermal power(Heat→ Electric energy)
3. Heat engines, such as the internal combustion engine used in cars, or the steam engine (Heat → Mechanical energy)
4. Ocean thermal power (Heat → Electric energy)
5. Hydroelectri dams( Gravitational potential energy → Electric energy)
6. Electric generator (Kinetic energy or Mechanical work → Electric energy)
7. Fuel cells (Chemical energy → Electric energy)
8. Battery (electricity) (Chemical energy → Electric energy)
9. Fire (Chemical energy → Heat and Light)
10. Electric lamp (Electric energy → Heat and Light)
11. Microphones (Sound → Electric energy)
12. Wave power (Mechanical energy → Electric energy)
13. Windmills (Wind energy → Electric energy or Mechanical energy)
14. Piezoelectrics (Strain → Electric energy)
15. Friction (Kinetic energy → Heat)
16. Electric heater (Electric energy → Heat)
17. Photosynthesis(Electromagnetic radiation → Chemical energy)
18. ATP hydrolysis(Chemical energy in adenosine triphosphate → mechanical energy)
