The Motor Effect

• the motor effect

  a current carrying wire in a magnetic field experiences a force
• ways to increase speed of a motor

  • stronger magnet
  • more coils
  • more current
• motors are DC
• Flemming's left hand rule

  • thumb - motion
  • index - field
  • middle - current
• electromagnetic induction - loudspeaker

  • fluctuating current flows in the coil
  • induced magnetism causes the coil to interact with permanent magnetic field
  • electromagnet is attracted or repelled by permanent magnet
  • coil moves up and down
  • movement of coil causes the speaker cone to vibrate a sound
• electromagnetic induction - bell

  • when switch is closed the magnet is on and attracts the hammer to the gong
  • a gap opening is then created in the circuit and hammer springs back
  • when the hammer springs back it recloses the circuit