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GCSE Physics · key term
A voltage produced across a conductor by a changing magnetic field.
Used by AQA, Edexcel and OCR
Specification 4.7.3.3 · Paper 2
A potential difference produced across a conductor by the generator effect.
Revise: MicrophonesIf the coil is connected in a complete circuit, this induced potential difference drives a current. The microphone has therefore transferred energy from the sound wave, through the mechanical movement of the diaphragm and coil, into an electrical signal.
Specification 13.2 · Paper 2
A voltage produced across a conductor when the magnetic field passing through it changes.
Revise: Factors Affecting InductionThe faster that field changes, the greater the induced potential difference. Moving the magnet or coil faster therefore increases it. If the magnet and coil remain still relative to one another and the field is unchanged, there is no induced potential difference.
Paper 1, Paper 2
Revise: Principles of Electromagnetic Induction and MicrophonesHolding the magnet still inside the coil does not produce a continuing induced potential difference because the field around the coil is no longer changing.
State that the induced potential difference alternates because the vibrating coil repeatedly reverses its direction of motion.
An induced potential difference exists across the coil; an induced current flows only when the coil is part of a complete circuit.
State that an induced potential difference can exist across an open conductor, but current flows only when the conductor is part of a closed circuit.
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