Generator Effect / Electromagnetic Induction

• What is the generator effect also known as?

  Electromagnetic induction
• What happens when a wire moves through a magnetic field?

  It induces a potential difference in the wire
• What occurs to the potential difference when the wire stops moving?

  The potential difference disappears
• Why does the potential difference disappear when the wire stops moving?

  Because there is no change in the magnetic field
• What happens to the direction of the potential difference when the direction is changed?

  The direction of the potential difference swaps
• What is required for the induced potential difference to generate a current?

  A complete circuit must be formed
• What happens if the wire is kept still while moving the magnets?

  The wire still experiences a change in the magnetic field
• What occurs when the wire moves back and forth without changing the magnetic field?

  No induced potential difference or current occurs
• How can we increase the size of the induced potential difference?

  • Change the strength of the magnetic field
  • Move the wire or magnets more quickly
  • Shape the wire into a proper coil with multiple turns
• What is the key idea in electromagnetic induction?

  A change in the magnetic field induces potential difference
• What happens when a magnet is moved into and out of a coil of wire?

  It induces a potential difference in the coil
• What occurs when the direction of the magnet is changed?

  The direction of the current changes
• How can the direction of the current be changed?

  By swapping the poles of the magnets
• What is necessary for a current to flow in the circuit?

  The circuit must be complete
• What are the main points about the generator effect and electromagnetic induction?

  • Movement of wire in a magnetic field induces potential difference
  • Potential difference disappears when wire stops moving
  • Current flows only in a complete circuit
  • Induced current can be increased by:
  • Strengthening the magnetic field
  • Increasing speed of movement
  • Adding more turns to the coil