GCSE Physics (AQA)

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The Generator Effect

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Magnetism and electromagnetism Induced potential, transformers and the National Grid

The Generator Effect

3:09 The Generator Effect
Spec 4.7.3.1
Previous Induced Potential Difference Next Force from an Induced Current
  • A conductor moving through a magnetic field can induce a current if part of a circuit.
  • A potential difference is induced across a conductor when it cuts through magnetic field lines.
  • This potential difference can generate an electric current if the conductor is part of a complete circuit.
  • Connecting the conductor to an ammeter can detect the presence of current.
  • A complete circuit is formed when the conductor is connected to the ammeter.
  • The ammeter needle twitches when the conductor passes through the magnetic field, indicating current flow.
  • This phenomenon is known as the generator effect, a key application of magnetic fields.
  • Current only flows when the conductor is moving through the field.
  • Moving the conductor up and down causes periodic movement of the ammeter needle and changes in current direction.
  • The generator effect can also be demonstrated by passing a magnet through a coil of wire in a circuit.
  • Coils of wire can produce stronger currents from the generator effect.
  • Connecting the coil to an ammeter forms a complete circuit.
  • Moving a bar magnet into the coil induces a current, as shown by the ammeter needle twitching.
  • Induced potential differences and currents depend on relative motion between a conductor and a magnetic field.
  • Continuous movement of the magnet is required to maintain current flow.

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