Generator Effect

• 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?

  By changing the strength of the magnetic field
• What effect does moving the wire or magnets more quickly have?

  It increases the induced potential difference
• How does shaping the wire into a coil affect the induced potential difference?

  More turns increase the induced potential difference
• What are the key ideas in electromagnetic induction?

  • Change in magnetic field induces potential difference
  • Complete circuit allows current to flow
  • Induced current can be increased by:
  • Strengthening the magnetic field
  • Increasing speed of movement
  • Adding more turns to the coil
• 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