Electric generators
I can describe how a dynamo works to generate DC and how an alternator works to generate AC.
Electric generators
I can describe how a dynamo works to generate DC and how an alternator works to generate AC.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Rotating a conducting loop in a uniform magnetic field induces a potential across the ends of the loop.
- An electrical generator can be made in the same way as an electric motor.
- A DC generator (dynamo) generates a varying DC current.
- The connections in an AC generator (an alternator) are different to those of a dynamo.
- An alternator makes an alternating current that repeatedly reverses direction as the coil spins round.
Keywords
Induced potential - The potential difference generated in a conductor moving relative to a magnetic field.
Direct current (DC) - An electric current that consistently flows in one direction.
Dynamo - A generator of direct current.
Alternating current (AC) - An electric current that repeatedly reverses direction.
Alternator - A generator of alternating current.
Common misconception
Magnets can attract or repel electric charges in a wire.
Explain that the correct explanation for what is happening is usually taught to pupils studying physics at university. At this point, it is sufficient to be able to describe and predict what happens when a conductor is moving in a magnetic field.
To help you plan your year 11 physics lesson on: Electric generators, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 11 physics lesson on: Electric generators, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 4 physics lessons from the Electromagnetism unit, dive into the full secondary physics curriculum, or learn more about lesson planning.
Equipment
Licence
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
A device that produces AC in a rotating coil.
A device that makes a current-carrying coil rotate.
A device that produces DC in a rotating coil.
