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Everyday Electricity Research Task Name: In this task you will build upon your knowledge of electricity to learn about how electricity is used in everyday life. Instructions This research task should be your own work. You may use the internet; your textbook; LMS; your Cornell Notes; or any other resource that you can find (except someone else’s work!) to complete this task. You have two lessons of class time to complete this task. Once it is done, upload your work to the Dropbox on LMS. Good luck! Introduction – Shock Tactics Video Watch the video Shock Tactics (either as a class or individually). Please be warned that the video contains some graphical images of medical procedures. Answer the following questions about the video. 1. What effect does an electric shock have on a normally functioning heart? 2. What does the controlled shock used at the start of a heart operation cause the heart to do? 3. What sort of shock is used to restart the heart? 4. What effect does increasing voltage in the conductor have on Dr Barker’s hand when he is touching it? Why is this dangerous? 5. Why is it useful to be able to listen to the electrical signals in muscles? 6. What is measured to see if the nervous system is damaged? 7. What historical beliefs about the medicinal effects of electricity did Dr Lawrence explain? 8. Do you think that the electrical beauty therapy techniques presented are likely to work very well? Why or why not? 9. What has Richard Hull built in his workshop? What does it do? 10. What was the conflict between Tesla and Edison about? 11. What did Edison do in order to prove his point? What did this result in the invention of? 12. What is the main advantage of AC over DC for electricity transmission? 13. How is the loss in energy overcome when transmitting AC electricity? Alternating Current (AC) or Direct Current (DC) 14. What happened when the guitarist hit the microphone stand with his strings? 15. How much current is enough to stop the heart? 16. What is the purpose of a fuse? 17. Why does a residual current device (RCD) offer greater protection from electrocution than a fuse? Use your textbook and other resources to complete the remainder of this research task. Electric Shock 18. What level of current is likely to cause death in humans? 19. What are the two main factors that affect the current that a person would experience when receiving an electrical shock? 20. How can current as small as 10mA still be fatal? 21. Why is it best to always touch electrical appliances that you are suspicious of with the back of your hand? Sources of Electrical Energy 22. What is the difference between Alternating Current (AC) and Direct Current (DC) 23. Name as many different sources as you can that are used to generate electricity for widespread distribution. 24. What source of generation does Victoria use to generate most of its electricity? 25. What is the range of voltages supplied in Victoria? 26. What is the frequency of the electricity supply in Australia (in cycles per second or Hertz) Household Wiring 27. The picture to the right is of a standard Australian electrical wall outlet. Correctly label each of the pins: Active, Neutral and Earth 28. What colour is the Active wire? 29. What colour is the Neutral wire? 30. What colour is the Earth wire? 31. Find some examples of other electrical wall outlets from around the world and paste them in the space provided (say which country they’re from). 32. Why are household circuits wired in parallel and not in series? Safety Devices 33. Which wire (A, N, E) should the switch be placed on in order to be as safe as possible? Explain why. 34. Why do some appliances not have an Earth connection plug? How can they still be as safe as those with an Earth? 35. What is the purpose of a fuse or circuit breaker? How do they work? 36. Why is an Earth Leakage System or Residual Current Device used? Electricity in Cars 37. Where is electrical energy stored in most cars? 38. What components of a car use electricity? Name as many as you can. 39. What part of the car is used to generate electrical energy (assuming it isn’t an electric car)? 40. What is the voltage of the electricity used in a car? 41. Are most circuits in a car wired in parallel or in series? 42. Cars often use a wiring system called an Earth return. What is this, how does it work?