Static electricity

1. Static electricity static principles Static uses static problems review tests resources

2. Principles of static electricity next previous

3. _ _ _ _ _ _ _ _ _ _ _ _ + + + + + + + + + + + + smart activity next previous smart

4. 1.Friction charges the objects Before _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ + + + + + + + + + + + + + + + + + + + + + + + + 2.Electrons move from the cloth to the rod 3.The rod becomes negative by gaining -charge After 4.the cloth becomes positive by losing -charge 5.only -charges move next previous

5. Negatively charged strip moves towards the wall _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ + + + + + + + + + + + Wall Negative charges are repelled away from the surface This makes the surface positively charged The rod is attracted to the wall We say that charge has been INDUCED The rod is moved away from the wall The negative charges return to the surface The wall becomes neutral again next previous

6. When insulating materials rub together they can become charged. Charging is caused by _______ has been rubbed off one material onto the other. Charge next previous

7. One object becomes _________ charged and the other becomes charged. There are types of charge. We call them positive and negative. Only charges can move. negatively friction next previous

8. Explain how objects become positively charged? LIKE CHARGES (- and – , + and +) UNLIKE CHARGES (+ and -)

9. Answers are on the next slide

10. When insulating materials rub together they can become charged. (charging is caused by ______). _______ has been rubbed off one material onto the other. One object becomes _________ charged and the other becomes ________ charged. There are ___ types of charge. We call them positive and negative. Only _______ charges can move. How do objects become positively charged? LIKE CHARGES REPEL (- and – , + and +) UNLIKE CHARGES ATTRACT(+ and -) friction Charge negatively positively two negative next previous

11. Uses of static electricity next previous

12. Ink jet printers next previous

13. + + + + + + + + + + How to print a full stop Positively charged nozzle next previous

14. + + + + + + + + + To print a line the top plate can be made more negative. next previous

15. + + + + + + + + + How is this letter i printed? The ink cartridge is moved horizontally at the same time. This allows any letters to be printed. next previous

16. Crop spraying next previous

17. I wish the sun would hurry up and ripen this orange! Help! I’m more worried about the farmers insecticide spray! The tale of the clever INSECT! next previous

18. + + I wish the sun would hurry up and ripen this orange! Help! I’m more worried about the farmers insecticide spray! OH NO! The farmer is using static electricity to charge the spray! Help! The tale of the clever FARMER! Can you explain what is happeninghere? next previous

19. + + • Why do the positively charged • droplets spread out as they • leave the nozzle? • What happens to the • droplets which go past • the leaves? Click for the answers • Like charges repel! • Instead of falling the • charged drops are • attracted back to the • orange! next previous

20. Explain why:- 1The paint spreads out after leaving the nozzle 2 Why is this useful? 3 Explain what happens to paint which goes past the object 4 Why is this useful? 1 all the droplets are negatively charged so they 2 It gives a wider spray so you get better coverage and an coat 3 It is attracted to the back of the object by the 4 It paints the back of the object and less paint is

21. electrostatic precipitation next previous

22. Metal chimney next next previous previous smart

23. Smoke particles reach the • positive metal plate + + - - - - Clean gases • electrons are removed and • travel towards the plate • the positive ions drift to • the earthed metal wall • Clean gases leave the • chimney • Smoke is deposited on • the chimney walls • The dust is removed and • used to make breeze • blocks next next next next previous smart previous

24. The dangers with static electricity next previous

25. Lightning strikes next previous

26. The problem! previous previous next next smart smart

27. The solution! The ground stroke is more likely to strike a pointed object The lightning conductor gives an path to the for the current The building is kept safe previous previous next next smart

28. Problems with aircrafts next previous

29. The most dangerous moment for any aircraft is NOT when it is flying NOT when it is landing when it is refuelling next next previous previous

30. The most dangerous moment for any aircraft is when it is refuelling Click to find out what happens! next previous

31. The most dangerous moment for any aircraft is when it is refuelling A metal bonding line connects the tanker to the aircraft BEFORE refuelling starts. next previous

32. REVIEW TESTS next previous

33. 1 Objects become charged by 2 Static electricity builds up on substances which are 3 Before rubbing objects together they will usually be

34. 4 An object becomes positively charged by 5 A negatively charged object has 6 Like charges always

35. 7 Unlike charges always 8 Only charges can move

36. Answers are on the next slide

37. 1 Objects become charged by __________ friction (rubbing) 2 Static electricity builds up on substances which are conductors/ insulators 3 Before rubbing objects together they will usually be neutral /charged 4 An object becomes positively charged by _______ _____________ losing electrons(negative charge) gaining 5 A negatively charged object has ______________ _______________ electrons(negatives) repel 6 Like charges always _______ 7 Unlike charges always _______ attract 8 Only _______ charges can move negative

38. END next previous