Energy Unit

1. A law that states all the energy in the universe is constant
4. A fanlike structure that is attached to a generator vital in electricity generation
5. Energy moving from one object to another
9. Energy that is stored by stretching or compressing
12. All the potential and kinetic energy of a system
14. The graveyard of kinetic energy
15. Using photovoltaic cells to collect sunlight for electricity generation
16. When two things rub together
18. Type of water heater that is most efficient
19. Formula to calculate potential energy
20. Ratio of useable energy to wasted energy
21. Energy stored in an object due to it's height above the Earth's surface

2. A nonrenewable energy source that is most commonly used throughout the world right now for electricity
3. Moving energy
6. Energy from the joining or splitting of the nucleus of an atom
7. Using the rise and fall of the ocean to generate electricity
8. Using the features of the home to save energy over time
10. Energy changing from one type to another
11. An energy source that uses heat from the Earth to generate electricity
13. Plant and animal waste used to create electricity
17. Stored energy