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Summary Electrodynamics Physical Science Grade 12
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Summary of the electrodynamics section of physical science taught in the grade 12 CAPS (NSC) syllabus. Includes diagrams, notes, definitions and extra information based on popular questions.

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  • January 18, 2024
  • 7
  • 2023/2024
  • Summary

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ELECTRODYNAMICS
Physical Science
Grade 12




Kimberly Fourie

, 1


INTRODUCTION




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Faradays law: the magnitude of the induced EMF is directly proportional to the rate of change of
the magnetic flux around the conductor.

Larger induced EMF:
• Use stronger magnets, therefore stronger magnetic field.
• Conductor is moved at right angles to the field.
• Increase the number of turns of coil.

Electromagnetic induction: the production of an induced EMF is due to a change in the magnetic
flux around the conductor.

Currents:
• Alternating current (AC) changes direction eg. generator/dynamo.
• Direct current (DC) has same direction eg. battery.

Advantages of AC:
• Easier to generate and transmit.
• Easier and cheaper to convert AC to DC than DC to AC if needed.
• AC motors produce higher power output.
• AC voltage easily changed with step-up/step-down transformers.




Kimberly Fourie

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