The Electric Motor

• What is the main topic of the video?

  The main topic is how an electric motor works.
• What is the motor effect in relation to a conductor carrying a current?

  • A conductor experiences a force in a magnetic field when carrying a current.
  • The direction of the force can be determined using Fleming's left hand rule.
• What rule is used to determine the direction of the force on a conductor in a magnetic field?

  Fleming's left hand rule.
• How does the direction of current affect the forces on a loop of wire in a magnetic field?

  • The current runs in opposite directions on either side of the loop.
  • This creates upward force on one side and downward force on the other side.
• What happens to the loop of wire when it rotates to 90 degrees?

  It stops rotating because the forces act to push it back to the 90 degrees position.
• What device is used to switch the direction of the current in an electric motor?

  • A split ring commutator.
  • It is a split metal ring connected to conducting brushes.
• What is the role of the split ring commutator in an electric motor?

  It allows the motor to keep rotating in the same direction by switching the current direction.
• How does momentum affect the operation of an electric motor?

  • The wire keeps turning due to momentum even after the current switches direction.
• What direction does the motor rotate when the forces are applied?

  Clockwise direction.