the electric motor

• What is the motor effect?

  It is the force experienced by a conductor carrying a current in a magnetic field
• What rule can be used to determine the direction of the force on a conductor in a magnetic field?

  Fleming's left hand rule
• What happens to a loop of wire carrying a current when placed in a magnetic field?

  • The wire experiences a force on both sides
  • The left side force acts upwards
  • The right side force acts downwards
  • This creates a moment causing rotation
• What direction does the loop rotate when a current is applied in a magnetic field?

  Clockwise direction
• What happens to the loop when it reaches 90 degrees?

  It stops rotating
• What occurs if the loop rotates beyond 90 degrees?

  The force on the left side acts downwards and the right side acts upwards
• How can the problem of the loop stopping at 90 degrees be solved?

  By switching the direction of the current
• What device is used to switch the direction of the current in an electric motor?

  Split ring commutator
• What is the function of the split ring commutator in an electric motor?

  • It switches the direction of the current
  • It allows continuous rotation of the motor
  • It connects to conducting brushes
• What happens to the current for a tiny fraction of a second during the motor's operation?

  The current switches direction
• What effect does momentum have on the loop after the current switches direction?

  The wire keeps turning due to momentum
• How does switching the direction of the current affect the forces on the loop?

  The force on the left side still acts upwards and the right side still acts downwards