Across
- 4. a measure of the amount of electrical potential energy an electron flowing in a circuit can gain and is measured in volts
- 7. electric current that changes its direction repeatedly
- 9. complete range of electromagnetic wave frequencies and wavelengths
- 11. device used to increase or decrease the voltage of an alternating current
- 12. a measure of how difficult it is for electrons to flow in a material
- 14. magnet created by wrapping a current-carrying wire around an iron core.
- 18. mechanical wave that causes particles in matter to move back and forth along the direction the wave travels
- 21. distance between one point on a wave and the nearest point moving with the same speed and direction
- 24. mechanical wave that causes particles in matter to move at right angles to the direction the wave travels
- 27. states that the angle the incoming wave makes with the normal to the reflecting surface equals the angle the reflected wave makes with the surface
- 31. disturbance that moves through matter and space and carries energy
- 32. repeated echoes of sound waves
- 33. the flow of electric charge, measured in amperes
- 34. states that the current in a circuit equals the voltage divided by the resistance in the circuit
- 35. closed conducting loop in which electric current can flow continually
- 36. electric currrent that flows only in one direction
- 37. bending of waves around an object
- 39. amount of energy a wave carries past a certain area each second
- 40. device that transforms electrical energy into kinetic energy
Down
- 1. material where electrons can move easily
- 2. light display that occures when charged particles trapped in the magnetosphere collide with Earth's atmosphere above the poles
- 3. surrounds every electric charge and exerts force on other electric charges
- 5. imbalance of electric charge on an object
- 6. waves that cant ravel through matter or empty space
- 8. material where electrons can't move easily
- 10. electromagnetic waves with wavelengths between about 400 billionths and 10 billionths of a meter
- 13. rapid movement of excess charge from one place to another
- 15. number of wavelengths that pass a given point each second
- 16. circuit that has more than one path for electric current to follow
- 17. electromagnetic waves with wavelengths between about one thousandth of a meter and 700 billionths of a meter
- 19. rate at which electrical energy is convertend into other forms of energy
- 20. region of space affected by Earth's magnetic field.
- 22. group of atoms whose fieldspoint at the same direction
- 23. device that uses a magnetic field to turn kinetic energy into electrical energy
- 25. attractive or repulsive force exerted by all charged objects on each other
- 26. circuit that has only one path for electric current to follow
- 28. change in direction of a wave when it changes speed as it travels from one material into another
- 29. human perception of the frequency of sound
- 30. surrounds a magnet and exerts a magnetic force on other magnets
- 38. postively or negatively charged atom