the generator effect

• What is the generator effect also known as?


  Electromagnetic induction
• What happens when a piece of wire bent into a coil is moved 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 experienced by the wire
• What happens to the direction of the potential difference when the direction of movement changes?


  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 the magnets are moved up and down?

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


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


  By changing the strength of the magnetic field, moving the wire or magnets more quickly, or shaping the wire into a coil
• What effect does using stronger magnets have on the induced potential difference?


  It induces a larger potential difference
• How does the speed of movement affect the induced potential difference?


  The faster the movement, the bigger the potential difference
• What is the effect of adding more turns to the coil?


  The bigger the induced potential difference will be
• What is the summary of the generator effect and its conditions?


  • A change in magnetic field induces a potential difference across the wire
  • A closed circuit allows current to flow
  • Increase current by:
  • Strengthening the magnetic field
  • Increasing speed of movement
  • Adding more turns to the coil
• What happens when a single magnet is moved into and out of a coil of wire?

  It induces a potential difference in the coil, generating a current
• 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 besides changing the magnet's direction?


  Swapping the poles of the magnets