Содержание
- 2. * Other ways of generating electricity
- 3. * Wind Power
- 4. * Tidal Power
- 5. * Wave Power
- 6. * Hydroelectric Power
- 7. * Biomass
- 8. * Biofuels Biomass can be used as a fuel in a number of ways: Fast-growing trees
- 9. * Solar Energy Heating for homes – these pipes carry water that absorbs heat energy and
- 10. * Geothermal Energy
- 11. * Geothermal Energy
- 12. * Solar Panels and Thermal Towers
- 13. * Using Solar Energy in remote places
- 14. * Electromagnetic Induction N The direction of the induced current is reversed if… The wire is
- 15. * Electromagnetic induction The direction of the induced current is reversed if… The magnet is moved
- 16. * AC Generators
- 17. * Other generators A dynamo works by the same principle. 1) How can you make its
- 18. Large-scale production of Electricity *
- 19. * DC and AC DC stands for “Direct Current” – the current only flows in one
- 20. * The National Grid Electricity reaches our homes from power stations through the National Grid: If
- 21. * Power Lines Here’s my new shed. I want to connect it to the electricity I
- 22. * Transformers Transformers are used to _____ __ or step down _______. They only work on
- 23. * Some transformer questions
- 24. * Some example questions A transformer increases voltage from 10V to 30V. What is the ratio
- 25. * The Cost of Electricity Electricity is measured in units called “kilowatt hours” (kWh). For example…
- 26. * The Cost of Electricity To work out how much a device costs we do the
- 27. * Reducing Energy Consumption Which one is more cost-effective? Jane wants to replace all the bulbs
- 28. * Energy and Power The POWER RATING of an appliance is simply how much energy it
- 29. * Some example questions What is the power rating of a light bulb that transfers 120
- 30. Topic 6 – Energy and the Future *
- 31. * The 9 types of energy
- 32. * The Laws of Physics There are many laws of physics, but one of the most
- 33. * Energy changes To describe an energy change for a light bulb we need to do
- 34. * Conservation of Energy In any energy change there is ALWAYS some “waste” energy: e.g. a
- 35. * Efficiency Efficiency is a measure of how much USEFUL energy you get out of an
- 36. * Some examples of efficiency… 5000J of electrical energy are put into a motor. The motor
- 37. * Energy Transfer (“Sankey”) diagrams Consider a light bulb. Let’s say that the bulb runs on
- 38. * Example questions
- 39. * Radiation An introduction… I’m very hot! I’m cool!
- 40. * Some examples of radiation
- 41. * Some examples of radiation
- 42. * Heat Loss from a House
- 43. * Radiation Practical
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