Induced Potential (HT only)

• What is induced potential in electrical conductors?

  It occurs only in a magnetic field
• What happens when a conductor moves through a magnetic field?

  It induces a potential difference across the ends
• What is induced across the ends of a conductor?

  A potential difference (voltage)
• What is the effect called when a current is induced in a conductor?

  The generator effect
• What does the induced current create around the conductor?

  A magnetic field around itself
• What does the induced magnetic field oppose?

  The original change in the magnetic field
• What happens when a magnet is moved into a coil of wire?

  It induces a current in the coil
• What occurs when a magnetic field is moved into a coil?

  The induced magnetic field tends to oppose it
• What should students recall about factors affecting induced potential?

  Factors affecting size of induced potential
• What does the direction of induced potential depend on?

  The direction of movement
• When is the current reversed in a conductor?

  When the magnet moves out of the coil
• What happens to the induced potential if the speed of movement increases?

  It increases the induced potential difference
• What happens to the induced potential if the magnetic field strength increases?

  It increases the induced potential difference
• What effect does increasing the number of turns on the coil have?

  It increases the induced potential difference
• What are the factors affecting induced potential in a conductor?

  • Speed of movement of the conductor
  • Strength of the magnetic field
  • Number of turns in the coil
• What happens to the induced current when the speed of movement is increased?

  • Induced potential difference increases
  • Induced current increases
• What happens to the induced current when the magnetic field strength is increased?

  • Induced potential difference increases
  • Induced current increases
• What happens to the induced current when the number of turns on the coil is increased?

  • Induced potential difference increases
  • Induced current increases