The generator effect

• What is the generator effect also known as?

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

  • Induces a potential difference in the wire
  • Potential difference indicated by plus and minus signs
• What happens to the potential difference when the wire stops moving?

  The potential difference disappears
• What creates the potential difference in the wire?

  The change in the magnetic field experienced by the wire
• What is required for a current to be generated?

  A complete circuit must be formed
• What happens if the wire is still and the magnets are moved?

  The wire still experiences a change in the magnetic field
• What occurs when the wire moves back and forth in the magnetic field?

  No induced potential difference or current is generated
• How can the size of the induced potential difference be increased?

  1. Change the strength of the magnetic field
  2. Move the wire or magnets more quickly
  3. Shape the wire into a proper coil with multiple turns
• What happens when a wire experiences a change in magnetic field?

  A potential difference is induced across the wire
• What generates a current in a complete circuit?

  The induced potential difference across the wire
• What happens when a magnet is moved into and out of a coil of wire?

  A potential difference is induced in the coil
• How does changing the direction of the magnet affect the current?

  It changes the direction of the current
• What can also change the direction of the current?

  Swapping the poles of the magnets
• What are the key concepts of electromagnetic induction?

  • Change in magnetic field induces potential difference
  • Complete circuit generates current
  • Induced current can be increased by:
  • Stronger magnetic field
  • Faster movement
  • More turns in coil