Magnets

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  • Created by: tljg
  • Created on: 08-12-15 19:35
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  • Magnets
      • Object which produces a magnetic field.
        • A magnetic field is an area of space where magnetic materials feel a force.
      • North & South pole.
        • Opposites attract (N&S / S&N).
        • Similar poles repel (N&N / S&S).
        • Always points from north to south.
      • 3 Magnetic elements;         Iron (steel)      Nickel            Cobalt
    • Methods to show the Magnetic field.
      • Place a magnet on a sheet of paper and place a plotting compass at five points at either end of the magnet. Follow the points in the direction of the arrow and join the points.
      • Place two magnets 5cm apart underneath a sheet of paper (Repelling / Attracting). Sprinkle iron fillings on the sheet of paper The pattern of the fillings will show the magnetic field
    • Electromagnets
      • Produce a magnetic field around the wire
      • The field produced is weak but can be made stronger by putting magnets together
    • Flemmings left hand rule
      • You can change the direction of the force by reversing the magnetic field
      • HOW CAN WE MAKE THE FORCE BIGGER?
        • Use a larger current
        • Use a stronger magnet
        • Use more wire
      • HAND RULE
        • ThuMb = Motion
        • First Finger = magnetic Field
        • SeCond finger = Current
    • The electric motor
      • Split ring communicator
        • Switches the direction of the current so the motor continues to turn in the same direction
        • Electrical energy to kinetic energy
    • Generators
      • KInetic energy to electrical energy
      • Needs a magnet, a coil of wire and one needs to be moving.
      • The current produced is alternating
      • HOW DO YOU MAKE THE VOLTAGE PRODUCED AS BIG AS POSSIBLE?
        • More kinetic energy in = More electrical energy out
        • Increase the number of coils in the wire
        • Increase the size of the coils
        • Increase the strength of the magnet
        • Use a magnetic material as the core

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