Light, Sound, Action: Section 1 and 2

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Across
  1. 3. The act of removing energy from a system.
  2. 6. A continuous disturbance of particles that transfers energy.
  3. 7. A device to measure current.
  4. 9. The number of complete cycles in one second. Unit: hertz.
  5. 14. A liquid or a gas.
  6. 15. Substance preventing transfer of heat or electricity.
  7. 19. The energy drop between two points. In electronics, the difference in electrical energy across a device. Also called voltage.
  8. 21. A material that does not readily allow heat or electrons to pass through it.
  9. 22. A single unit to supply energy to a circuit (many cells combine to form a battery).
  10. 23. The distance between two points on a wave that are moving in phase. Unit: metres.
  11. 28. A physical quantity of either positive or negative value.
  12. 29. A statement made before an investigation, suggesting your ideas about the outcome.
  13. 32. A sequence.
  14. 33. The connection of a device to the Earth to prevent build up of charge.
  15. 35. A representation of the real world.
Down
  1. 1. A flexible strand of metal used to make an electrical circuit.
  2. 2. A device to supply electrical energy from chemical energy.
  3. 4. wave velocity = frequency x wavelength.
  4. 5. The maximum displacement from an equilibrium position (middle to crest in a wave).
  5. 8. The process of energy transfer through movement of particles (in gas or liquid form).
  6. 10. A small fundamental particle with a negative charge.
  7. 11. The process by which heat or electricity is transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the substance.
  8. 12. A quantity that can be altered or controlled.
  9. 13. A closed loop.
  10. 16. the energy possessed by an object due to the collective movement of particles within the object.
  11. 17. An object or type of material (usually metal) that allows the flow of an electrical current or heat in one or more directions.
  12. 18. A device that connects an electrical lead to a solid object.
  13. 20. A minute portion of matter.
  14. 24. Electric current that oscillates backwards and forwards rather than travelling in one direction. In Australia the oscillations occur at a rate of 50 Hz; in the US at 60 Hz. AC is used for long distance transmission of electrical power and is what is provided from all household power supplies.
  15. 25. Moving
  16. 26. The capacity to do work.
  17. 27. Electrical connectors.
  18. 30. electric current that travels only in one direction. Electric cells and batteries produce direct current.
  19. 31. The flow of electrons in a circuit. Current is measured in amperes, or amps (A).
  20. 34. The ratio of mass and volume of an object.