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  • Current Syllabus
  • Advanced Mechanics
  • Electromagnetism
  • The Nature of Light
  • From the Universe to the Atom
  • Pre-2019 Syllabus
    • Space
    • Motors and Generators
    • From Ideas to Implementation
    • Astrophysics
  • Other Subjects
  • EasyChem – HSC Chemistry
  • EasyHSC – HSC Business Studies
  • EasyBio – HSC Biology
  • Search

Generating Voltage

Motors and Generators > Generating Voltage

The relative motion between a conductor and magnetic field is used to generate an electrical voltage

Students learn to:

  • outline Michael Faraday’s discovery of the generation of an electric current by a moving magnet
  • define magnetic field strength B as magnetic flux density
  • describe the concept of magnetic flux in terms of magnetic flux density and surface area
  • describe generated potential difference as the rate of change of magnetic flux through a circuit
  • account for Lenz’s Law in terms of conservation of energy and relate it to the production of back emf in motors
  • explain that, in electric motors, back emf opposes the supply emf
  • explain the production of eddy currents in terms of Lenz’s Law

Students:

  • perform an investigation to model the generation of an electric current by moving a magnet in a coil or a coil near a magnet
  • plan, choose equipment or resources for, and perform a first-hand investigation to predict and verify the effect on a generated electric current when:
    • the distance between the coil and magnet is varied
    • the strength of the magnet is varied
    • the relative motion between the coil and the magnet is varied
  • gather, analyse and present information to explain how induction is used in cooktops in electric ranges
  • gather secondary information to identify how eddy currents have been utilised in electromagnetic braking

Extract from Physics Stage 6 Syllabus (Amended October 2002). © 2009, Board of Studies NSW.

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