P2 Keyword Crossword

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Across
  1. 1. network of cables and transformers that links power stations to consumers across the country.
  2. 6. device that measures electric current.
  3. 8. device that measures potential difference.
  4. 9. fundamental property of matter that results in an electric field around an object; objects can be electrically positive, negative or neutral (no overall charge); symbol Q, unit coulomb, C.
  5. 13. amount of energy transferred each second; symbol P, unit watt or joules per second, W or J/s.
  6. 18. SI unit of potential difference, symbol V; 1 V is the potential difference between two points on a conducting wire when an electric current of 1 A dissipates 1 W of power between those point.
  7. 19. circuit component that stores energy in the form of chemical energy; a number of electric cells may be joined to form a battery.
  8. 20. electric circuit in which all components are connected one after the other in a single line.
  9. 22. electric circuit component with a resistance that decreases as its temperature increases.
  10. 23. ratio of the potential difference across an electrical component to the current through the component; symbol R, unit ohms, Ω.
  11. 25. electric circuit component that glows when a potential difference is applied to it.
  12. 26. material or object that allows electric charge to flow through it.
  13. 28. electric circuit in which the current divides into two or more paths before combining again.
  14. 30. a resistor obeys Ohm’s law if the current in the resistor (at constant temperature) is directly proportional to potential difference across it.
  15. 31. see potential difference.
  16. 32. SI unit for power, symbol W; a power of 1 W is equal to 1 J of energy transferred in 1 s.
  17. 33. SI unit of electric current , symbol A; an electric current of 1 A is equal to 1 C of charge passing through a point in a circuit in 1 s.
  18. 34. material that does not allow electric charges to pass through it (e.g., wood).
  19. 35. electrical connection between the metal case of an electrical appliance and the ground, used as a safety device to prevent the case becoming charged if touched by a live wire.
  20. 36. transformer that changes an alternating potential difference across the primary coil to a lower potential difference across the secondary coil.
Down
  1. 2. electric current component with a resistance that decreases as the intensity of the light falling upon it increases.
  2. 3. SI unit of electrical resistance, symbol Ω; a component with a resistance of 1 Ω allows a current of 1 A to flow when a potential difference of 1 V is applied.
  3. 4. process in which energy is moved from one store to another
  4. 5. conducting wire connection that carries the alternating current from the supply
  5. 7. electric component that produces a desired amount of resistance to the current within it when a potential difference is applied across it.
  6. 9. SI unit of electric charge, symbol C.
  7. 10. visual representation of an electrical component; a standard symbol exists for each type of electrical component.
  8. 11. conducting wire connection that allows electric charge to return to its source.
  9. 12. a measure of the energy transferred per unit charge as charges move between two points in a circuit – also called the voltage between two points.
  10. 14. visual representation of electrical components connected by wires, using standard symbols.
  11. 15. any resistor that obeys Ohm’s law at constant temperature
  12. 16. flow of electric charge; the size of the electric current is the rate of flow of electric charge; symbol I, unit amps (A).
  13. 17. SI unit of energy, symbol J.
  14. 21. flow of electric charge in one direction only.
  15. 24. device used to increase (step up) the potential difference of an alternating signal or decrease it (step down).
  16. 27. circuit component with a low resistance if it is connected one way around in a circuit, or a very high resistance if it is connected the other way around; a diode allows current in one direction only.
  17. 29. a particle that orbits the nucleus in all atoms; electrons have a negative electric charge.
  18. 36. transformer that changes an alternating potential difference across the primary coil to a higher potential difference across the secondary coil.