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  1. Real transformers
  2. first coil called primary
  3. maximum emf
  4. wire&wire
  5. electromagnetic waves
  6. ω
  7. decrease
  8. Step-up transformer
  9. 230 000V
  10. 0 emf
  11. Faraday's Law of Induction
  12. James Clerk Maxwell
  13. transverse waves
  14. mechanical energy
  15. AC can be converted to DC
  16. Second coil called secondary
  17. Heinrich Hertz
  18. right
  19. size & rotating
  20. same
  21. motor
  22. 3rd
  23. CHANGE
  24. magnetic field
  25. waves
  26. volt (V)
  27. back emf
  28. frequency
  29. lens law
  30. Back emf
  31. Electromagnetic induction
  32. increase
  33. electromagnetic in nature
  34. M
  35. Step-down transformer
  36. emf from one loop
  37. perpendicular
  38. Lenz's law
  39. 12V
  40. particles
  41. bar magnet
  42. Equation for single loop
  43. single force
  44. emf for generator (maximum)
  45. -rotate a wire
    -drag a wire through magnetic field
    -move a magnetic field across a wire
  46. Electromagnetic Radiation
  47. emf
  48. The Ignition coil
  49. Mutual inductance
  50. wave-particle duality of light
  51. inverse square law
  52. electrons
  53. accelerating charges
  54. Michael Faraday
  55. emf & current
  56. charged particular
  57. reduce
  58. opposite
  59. Ohm's Law
  60. induced field
  61. AC current
  62. permanent magnet
  63. equation for multiple loops
  64. photon
  65. number
  66. transformers
  67. orientation
  68. potential difference
  69. transformer equation
  70. parallel
  71. energy
  72. -speed of wire or magnetic field motion
    -length of wire in the field
    -strength of magnetic field
  1. a ___performed experiments that generated and detected EM waves and confirmed Maxwell's predictions.
  2. b The current induced in the wire by moving through a magnetic field will generate its own _______
  3. c Notion that EM waves behave like particles is called the____
  4. d __ depends on the shape of the coils and how they are orientated to each other
  5. e emf unit is the
  6. f Magnitude of emf depends on (3):
  7. g when the armature is parallel to the magnetic field in a generator, you get ____
  8. h three ways to induce current
  9. i When you have multiple loops, you multiple the number of loops (N) by the ____
  10. j The increase in emf means a____ in current
  11. k A particle of light is called a____ - carries energy, but has no mass
  12. l increases the emf, N2 is greater than N1
  13. m As the coil moves out of the magnetic field the induced field is in the_____ direction as the original and they attract each other
  14. n As the loop rotates from one arm being up to the other being up, the current flow will change direction - producing ____
  15. o Energy transported by EM waves is called ____
  16. p The induced field does not oppose applied field, but the____ in the applied field
  17. q An decrease in emf means an____ in current
  18. r If the applied field changes, the _____ helps to keep it constant
  19. s Changing the____ of coils in the secondary coil can change the induced emf in the secondary coil - used in making transformers
  20. t decreases the emf, N2is less than N1
  21. u _____ are only 90-99% efficient - power is lost due to small currents induced by changing magnetic field and resistance in the wires
  22. v As a motor turns more quickly, the net emf and net current in the coil___
  23. w Predicts the magnitude of induced emf
  24. x A device that increases or decreases the emf of alternating current
  25. y Current can also be generated in a magnetic field by changing the_____ of the loop in the magnetic field
  26. z ∆V2/∆V1 = N2/N1
  27. aa when the armature is perpendicular to the magnetic field in a generator, you get____
  28. ab motion of _____ through a wave makes it move
  29. ac ____created a set of equations that explain the relationship between electric and magnetic fields
  30. ad current in this coil magnetizes the iron core
  31. ae Induced current is greatest if the wire and magnetic field are_____ to each other
  32. af The magnetic field force pushes the___ through the wire
  33. ag Current is supplied to loops and that magnetic field repels ______ and causes the loops to rotate
  34. ah emf = NAβω
  35. ai The induced magnetic field is similar to a _____- and creates a force that repels the original magnetic field
  36. aj ____ is the ability of one circuit to induce emf in a nearby circuit in the presence of a changing magnetic field
  37. ak electromagnetic waves are ___
  38. al Oscillating Electric and Magnetic waves - at___ angles to each other
  39. am Some high energy EM waves will behave like____
  40. an current runs through the 2nd coil because it is wrapped around magnetized iron
  41. ao Electromagnetic waves transfer____ - stored in the oscillations of the electric and magnetic fields
  42. ap is the angular speed of rotation of the loop (2πf)
  43. aq Because AC current changes direction, the____ and____ in an AC circuit is not constant
  44. ar Car batteries provide a constant DC emf of ___
  45. as A generator produces changing____, because of its constant rotating
  46. at convert electrical energy to mechanical energy
  47. au tells the direction of the induced emf
  48. av Electric and magnetic forces are aspects of a ____ - called electromagnetic force
  49. aw The motor's magnetic field generates its own emf called ___
  50. ax Low-energy photons behave more like ___
  51. ay Electromagnetic force obeys the ____ - as the two objects move further apart the force between them weakens
  52. az The____ of rotation of the loop in a generator will determine how often the current changes direction -> f = 60Hz in US
  53. ba if the angle is zero the wire is____ to the magnetic field
  54. bb Use the ___ right hand rule to figure out the direction of current flow in the wire
  55. bc Oscillating electric and magnetic fields create
  56. bd In the US, power companies step-up emf to about ____
  57. be You can use ____ to find resistance
  58. bf producing current in a wire by placing it in a changing magnetic field
  59. bg The _____ supplied to the motor equals the applied emf minus the back emf, this also reduces current
  60. bh ____ in the engine is a transformer that increases this emf to a great enough value to cause a spark between the gaps of a spark plug
  61. bi N∆ϕM/∆t
  62. bj Either the ____ can move in the magnetic field or the field can move around the ____ - one or the other must move to induce current.
  63. bk Maxwell predicted that light was ___-
  64. bl add rings (slip rings) and brushes to the end of the loops, the moving rings counter the changing current and create direct current for a circuit
  65. bm ____ increases as the magnitude of the magnetic field changes at a higher rate
  66. bn "The magnetic field of an induced current is in a direction to produce a field that oppose the change causing it"
  67. bo Most power plants use a source of _____ to turn a turbine in a magnetic field to generate current.
  68. bp Changing the ___ of the loops of wire or _____ the loop in the magnetic field will change the amount of induced current
  69. bq who first demonstrated the principle of electromagnetic induction
  70. br emf = -∆ϕM/∆t
  71. bs As the magnetic field approaches the wire, the wire's magnetic field is in the____ direction of the increasing magnetic field
  72. bt All EM waves are produced by ____ - a charge moves up/down through the wave at a certain frequency