Bozo Bucket Review - PowerPoint Presentation

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Bozo Bucket Review

Chapter 21

Chapter 21Slide2

You and your teammates will each take turns answering review questions.If correct, your team will earn a point. You also will have a chance to shoot a paper wad into the trash bin from a designated distance.If you make your basket, your team will earn an additional one, two, or three points!

Rules of GameSlide3

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QuestionsSlide4

Question 1Earth’s magnetic field and a bar magnet both attract particles to the same locations. Where are they?A) the middle of the magnetB) all around the outsideC) the North and South polesD) first to the middle, then to the endsSlide5

Question 2What must happen for an electromagnet to have a magnetic field?A) It must be heated.B) It has to be touching another magnet.C) It must be lined up with Earth’s magnetic field. D) It must be connected to an electrical source.Slide6

Question 3What happens when two south poles of magnets are placed together? A) they repel each otherB) they attract each otherC) they cancel each other outD) the strength of the magnet is doubledSlide7

Question 4Ancient people discovered magnetic rocks called lodestone. What did they use them for?A) to start firesB) compassesC) sculpturesD) telephone receiversSlide8

Question 5If two magnets were in this order: SN SN, they would:A) repel each otherB) attract each otherC) do nothingD) none of the aboveSlide9

Question 6You can tell if an object is magnetic if the grouping of atoms:A) Are scattered in all different directions.B) Are lined up in the same direction.C) Are lined up in opposite directions.D) Are half lined up and half scattered.Slide10

Question 7How can you make a magnet lose its magnetism?A) by heating itB) by blowing on itC) by hitting it very hardD) both A and CSlide11

Question 8A current carrying coil with many loops is called a(n) _________________.Slide12

Question 9If you add more coils to a solenoid or increase the current, what happens to the strength of an electromagnet?Slide13

Question 10The flow of charges through a material is called _________________.Slide14

Question 11How many days of school are left? (Don’t count today, holidays, or Saturdays or Sundays)Slide15

Question 12A material through which charge can flow easily is known as a(n) __________________.Slide16

Question 13A complete path through which electric charges can flow is known as a(n) ________________.Slide17

Question 14What subatomic particle in an atom gives it a magnetic field?Slide18

Question 15What is the name of the device that has a magnetized needle that can spin freely? Slide19

Question 16An electric generator converts ____________ energy into ___________ energy.Slide20

Question 17A transformer increases or decreases A) energyB) resistance C) voltageD) direct currentSlide21

Question 18What happens to the poles when you break a bar magnet in half?Slide22

Question 19True or False: Moving a magnet relative to a coil of wire induces a current in the wire if the coil is part of a complete circuit.Slide23

Question 20Nickel is considered a(n) _________________ material because it contains magnetic domains.Slide24

Question 21A solenoid with a ferromagnetic core is called a(n) ___________________.Slide25

Question 22This is the area that is influenced by the Earth’s magnetic field.Slide26

Question 23This is a device with fanlike blades that converts energy from various sources to electrical energy.Slide27

Question 24Name two types of generators.Slide28

Question 25An electronic device contains a transformer. Its primary coil has 200 turns, and its secondary coil has 20 turns. If the device is plugged into a 120-volt line, what is the output voltage of the device?Secondary coil turns = output voltage Primary coil turns input voltageSlide29

Question 26This device is used by doctors to create more detailed images of the human body than are possible with X-rays.Slide30

Question 27What day is your final exam on for your class?Slide31

Question 28What type of magnet keeps its magnetism for a long time? Slide32

Question 29A magnet’s field lines always start near the magnet’s ____________ pole.Slide33

Question 30Electromagnetic devices like an electric motor convert ___________ energy into ____________ energy.Slide34

Question 31What causes a ferromagnetic material to become magnetic?A) unpaired electrons B) paired electronsC) unpaired protonsD) paired protonsSlide35

Question 32A galvanometer is a device used to measure ________________.Slide36

Question 33True or False: In an alternating current produced by an AC generator, the flow of direction of charges switches back and forth.Slide37

Question 34A charge moving in a magnetic field will be deflected in a direction that is ____________ to both the magnetic field and to the velocity of the charge.Slide38

Question 35A ____________ transformer decreases the voltage so that it can enter homes safely.Slide39

Answer Key1. C2. D3. A4. B5. B6. B7. D8. solenoid9. increases strength10. current11. 11 days12. conductor13. circuit14. electron

15. compass16. mechanical, electrical17. C18.

each magnet has a N & S pole19. True20. ferromagnetic

21. electromagnet

22. magnetosphere

23. turbine

24. AC and DC generators25. 12 volts26. MRI27. day varies w/ class hour28. permanent 29. north30. electrical, mechanical31. A32. current33. True34. perpendicular35. step-down