the generator effect

• Induced potential


  Potential difference induced across the ends of a wire when it is moved through a magnetic field
• Generator effect


  Induced current in a complete circuit when a wire is moved through a magnetic field
• Inducing potential difference


  1. Move wire up through magnetic field

  2. Potential difference induced

  3. Stop moving wire

  4. Potential difference lost

  5. Move wire back down

  6. Potential difference induced in reverse direction
• The induced potential difference is called the induced potential
• If there is a complete circuit, the induced potential difference induces a current, which is called the generator effect</b>
• The direction of the induced current switches when the direction of movement switches
• If the wire moves along the magnetic field, there is no induced potential difference or current
• Factors affecting size and direction of induced potential


  • Stronger magnetic field
  • Faster movement of wire
  • More turns in coil
• Inducing current in a coil


  1. Move magnet in and out of coil

  2. Induced current in coil
• Switching the poles of the magnet switches the direction of the induced current
• Induced current creates its own magnetic field

  Opposes the movement of the magnet
• The induced current makes it harder to move the magnet, so work is done