Across
- 4. indicator that tells whether electricity is flowing
- 6. hotness or coldness of something
- 7. objects that allow light to pass through them
- 8. oppose the flow of an electric current
- 10. a complete conducting path along which electricity flows
- 13. a form of energy resulting from the existence of changed particles
- 16. allows light to disperse into a band of colors through it
- 18. a patch of darkness
- 19. Objects that prevent light from passing through them
- 20. allows electricity to flow
Down
- 1. does not allow electricity to flow
- 2. An object that do not produce light.
- 3. protects an electrical system from overloading
- 5. portable source of electricity
- 9. negatively charged particles
- 11. an instrument used to measure temperature
- 12. this happens when solids are heated
- 14. objects that allows some light to pass through them
- 15. a form of energy that makes it possible for us to see
- 17. the changing of the direction of light rays when they pass from one transparent medium to another