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Across 2. The unit used to measure electric current 4. A material which does not conduct electricity 8. This device converts kinetic enrgy into electrical energy 10. This device converts electrical energy into kinetic energy 12. Steps up or steps down voltage 13. Sources of energy which can be replaced 15. The value of the potential difference between two points in a circuit 18. The ratio of useful energy obtained from a device, compared with energy put in to it 20. An electronic component whose resistance varies with light intensity 22. Electricity produced by the fission of uranium atoms 23. A battery which is able to have its energy replaced 24. A magnetised piece of metal surrounded by an electric field 25. A lighting device whose resistance increases as the voltage increases 28. Reverses the direction of current in a motor 34. An electronic component whose resistance varies with temperature 35. A system of cables which transports electricity around the UK 36. The rate of flow of electrons 37. An electrical safety device containing a thin piece of wire 40. The unit of potential difference 41. An electronic component designed to produce a known resistance 42. The most common type of battery 43. A type of circuit in which all the components are connected in one loop 44. A circuit where components are connected in a number of interconnected loops

Down 1. The generation of an electric current by passing a wire through a magnetic field 3. A device which is able to transform light energy into electrical energy 5. The colours of a plugs earth wire 6. Electricity produced by the downhill flow of water 7. An instrument for measuring electric current 9. The property of materials to resist the flow of electrons 11. A property of materials that have no resistance to electric current at low temperatures 14. Electricity produced from water heated by underground rocks 16. The rate at which work is done. The product of current x voltage 17. A scientific way of drawing the efficiency of energy transfers 19. A complete loop, containing electrical components 21. The ability to do work 26. Used on a bicycle to generate electricity 27. An instrument for analysing different electric current 29. The unit used to measure resistance 30. This resource can be used to generate electricity using large turbines with blades located in high places 31. A type of train moved by electro magnets 32. An instrument for measuring the potential difference across a component 33. A device that uses a chemical reaction to generate electricity 38. The unit of electrical power 39. Electricity produced by the movement of water between tides