Across
- 4. the number of waves passing a set point per second
- 5. a device that converts kinetic energy into electrical energy
- 6. ratio of useful energy output to total energy input
- 7. an element used to make semiconductors
- 8. device that displays a graph of voltage against time
- 10. mixture of gases, mainly nitrogen and oxygen
- 11. an electric current that changes direction
- 16. the ability to do work
- 17. unit of electrical energy, equal to 3,600,000 J
- 19. coal, gas, oil are examples
- 20. converts Sunlight to electrical energy
- 21. boundary between two special types of silicon in a photocell and other components
- 22. unit of power
- 23. gas that contribute to the greenhouse effect
Down
- 1. between microwaves and visible light
- 2. particles in fluids gain thermal energy from a warmer region and move into a cooler region, taking the energy with them
- 3. increase in the Earth's temperature due to increases in levels of
- 5. an electric current that flows in only one direction
- 9. the rate that a system transfers energy
- 12. energy that can be replenished at the same that it's used
- 13. changes alternating current of one voltage to alternating current
- 14. waste wood and other natural materials that are burned in power stations
- 15. a unit of energy
- 17. 1000 watts
- 18. changes linear kinetic energy to circular kinetic energy
- 21. converts light to electrical energy