Electromagnetic induction
The production of a when the magnetic flux linking a conductor changes. Moving a conductor through a or changing the field around a coil can cause it. This is the principle behind generators and ; the induced voltage depends on the rate of change, not simply on a magnet being present.
Using Electromagnetic induction in context
Updated
A distinction worth remembering
Induction depends on changing magnetic flux linkage. A stationary conductor in an unchanging magnetic field does not automatically have an induced voltage.
Questions to take further
- How can I revise Electromagnetic induction beyond the definition?
- Explain what Electromagnetic induction describes, compare it with a related term and use it in a topic question. State any assumptions and what evidence you would need before applying the idea to real work.
Sources
- OpenStax University Physics: Changing magnetic flux and induction — The physical principle used in this comparison; technical installation requirements remain separate.
Where Electromagnetic induction fits in the learning path
The Electrical Science section covers these units:
- Circuit Fundamentals
Curriculum mapping: C&G 2365 Units 202/302.
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- Three-Phase PowerElectrical Science
- Ohm's LawElectrical Science
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3. Return to the meaning
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Recall a related term
Which term fits this definition? Say it to yourself, then reveal it. This is a memory prompt, with no score or saved result.
The region in which a magnet or current-carrying conductor can exert magnetic force. Drawn field lines show direction and give a visual guide to strength, but they are a model rather than physical wires. Changing magnetic flux through a coil can induce a voltage, linking this idea to motors and transformers.
Magnetic field
Read the Magnetic field entryCompare related terms
Open a meaning to compare its role with Electromagnetic induction, or follow its full entry.
Magnetic field
The region in which a magnet or current-carrying conductor can exert magnetic force. Drawn field lines show direction and give a visual guide to strength, but they are a model rather than physical wires. Changing magnetic flux through a coil can induce a voltage, linking this idea to motors and transformers.
Read the Magnetic field entryTransformer
A device that transfers electrical energy between windings through a changing magnetic field. It can raise or lower AC voltage according to the winding arrangement, with losses meaning output power is below input power. A site centre-tapped transformer also changes how its output is referenced to earth.
Read the Transformer entryAC — Alternating Current
Alternating current reverses direction repeatedly, unlike direct current. An AC voltage also changes polarity over its cycle. Frequency, measured in hertz (Hz), tells you how many complete cycles occur each second. In a three-phase system, the three AC waveforms are offset in time; three-phase does not mean three times the frequency.
Read the AC entryA definition is a start. Using it in a real question is where it sticks.