GCSE Physics (AQA)

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Factors Affecting an Induced Potential Difference

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Magnetism and electromagnetism Induced potential, transformers and the National Grid

Factors Affecting an Induced Potential Difference

5:38 The Generator Effect
Spec 4.7.3.1
Previous Force from an Induced Current Next Parts of a Transformer
  • The size and direction of potential difference and current induced by a magnetic field are influenced by various factors.
  • A potential difference can be induced in a conductor by having it cut the field lines of a magnetic field.
  • If the conductor is part of a circuit, this potential difference will cause a current to flow.
  • Stronger magnetic fields induce larger potential differences.
  • Using two identical conducting coils and different magnets results in different potential differences.
  • A weak magnet with a weak field results in low potential difference and current.
  • The current and potential difference of the coil are proportional to each other, assuming constant coil resistance.
  • A stronger magnet with a stronger field through the coil results in a high potential difference and current.
  • Faster movement induces larger potential differences.
  • Moving the magnet slowly results in a low potential difference and current, while moving quickly results in a higher potential difference and current.
  • Larger potential differences are induced in coils with more turns.
  • Wrapping the coil more times results in a higher potential difference and current.
  • Reversing the direction of motion reverses the potential difference.
  • Using two magnetic poles and waving a conductor between them demonstrates potential difference direction change.
  • Reversing the field direction also reverses the potential difference.
  • Field lines always point from a north pole to a south pole.
  • Factors affecting the size of induced potential difference and current include field strength, speed of motion, and number of coils.
  • Reversing the direction of the field or motion reverses the potential difference and current.

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