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 is shown by plus and minus signs
• What happens to the potential difference when the wire stops moving?

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

  The change in the magnetic field
• What is required for the induced potential difference to generate current?

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

  A potential difference is still induced
• Why does moving the wire back and forth not induce a potential difference?

  The wire isn't experiencing a change in the magnetic field
• How can we increase the size of the induced potential difference?

  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
• What occurs when the ends of the wire are connected in a closed circuit?

  A current flows around the circuit
• 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
• How can the direction of the current be changed besides moving the magnet?

  By swapping the poles of the magnets
• What are the key concepts of electromagnetic induction discussed?

  • Induced potential difference occurs with magnetic field changes
  • Requires a complete circuit for current flow
  • Can increase potential difference by:
  • Strengthening the magnetic field
  • Increasing movement speed
  • Adding more turns to the coil