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GCSE Physics · key term
The production of a potential difference across a conductor when the magnetic field through it changes.
Used by AQA, Edexcel and OCR
Specification 4.7.3.4 · Paper 2
The production of a potential difference across a conductor because the magnetic field around it changes.
Revise: TransformersBecause the magnetic field around the secondary is changing, electromagnetic induction produces a potential difference across its ends. If the secondary is part of a complete circuit, this induced potential difference drives an alternating current.
Specification 13.1P, 13.3P, 13.4P, 13.5 · Paper 2
The production of a potential difference across a conductor when it moves relative to a magnetic field, or when the magnetic field through a coil changes.
Revise: Producing Electric CurrentIf the conductor forms part of a complete circuit, that potential difference drives an induced current. This is electromagnetic induction, also called the generator effect. It is the reverse starting point from the motor effect: instead of using a current to produce movement, we use movement to produce an electrical output.
The production of a potential difference when a conductor moves through a magnetic field or the magnetic field through it changes.
The production of a potential difference when a conductor moves relative to a magnetic field.
Specification P4.2e, P4.2f, P4.2g, P4.2j · Paper 1 (Foundation), Paper 3 (Higher)
The production of a potential difference across a conductor because the magnetic field around or through it changes.
Revise: Electromagnetic inductionA current creates a magnetic field, but the link also works in another way: when the magnetic field around a conductor changes, a potential difference is induced across the conductor's ends. This process is called electromagnetic induction.
The production of a potential difference across a conductor when the magnetic field through it changes, for example as it moves through a magnetic field.
The production of a potential difference across a conductor when the magnetic field linking it changes.
The production of a potential difference across a conductor when the conductor experiences a changing magnetic field, for example by moving through a magnetic field.
Paper 1, Paper 2
The production of a potential difference across a conductor when the magnetic field around it changes.
Revise: Principles of Electromagnetic Induction and MicrophonesIf the magnetic field around a conductor changes, a potential difference is induced across the conductor's ends. This process is called electromagnetic induction.
Name the correct effect: electromagnetic induction in a moving-coil microphone; the motor effect in a loudspeaker or headphones.
For a dynamic microphone, write about electromagnetic induction: the coil moves through a magnetic field and an alternating potential difference is induced. Do not describe this as the motor effect.
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