motor

• What produces a permanent magnetic field in a motor?

  Permanent magnets
• What role does the battery play in a motor?

  It causes current to flow through the rectangular coil
• Where are the rectangular coils located in a motor?

  Inside the permanent magnet's field
• What do the brushes do in a motor?

  They press onto the metal split ring commutator
• What is the function of the split ring commutator in a motor?

  It causes the direction of the current to change every half turn of the coil
• What are three ways to make a motor spin faster?

  Increase the current, increase the strength of the magnetic field, increase the length of the conductor
• What happens to the current in the coil every half-turn?

  The split ring commutator reverses the current through the coil
• Why is graphite used for brushes in a motor?

  Graphite conducts electricity and is very slippery, causing little friction
• How does the force on each side of the coil contribute to its rotation?

  The force on one side is in the opposite direction to the force on the other side, creating a turning effect
• What is the result of the continuous motion in one direction of the motor?

  The rotating shaft can drive devices such as drills and radio-controlled cars