P14 syllabus statements
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P14 syllabus statements P14 syllabus statements Presentation Transcript

  • 02/06/14 P14 Electromagnetic effects Syllabus statements
  • 14.1 Electromagnetic induction 1. Describe an experiment that shows that a changing magnetic field can induce an e.m.f. in a circuit. 2. State the factors affecting the magnitude of an induced e.m.f.
  • 14.2 A.C. generator 1. Describe a rotating-coil generator and the use of slip rings. 2. Sketch a graph of voltage output against time for a simple a.c. generator.
  • 14.3 Transformer 1. Describe the construction of a basic iron-cored transformer as used for voltage transformations. 2. Recall and use the equation (Vp / Vs) = (Np / Ns) 3. Describe the use of the transformer in highvoltage transmission of electricity.
  • 14.3 Transformer 4. Recall and use the equation Vp Ip = Vs Is (for 100% efficiency). 5. Explain why energy losses in cables are lower when the voltage is high.
  • 14.4 The magnetic effect of a current 1. Describe the pattern of the magnetic field due to currents in straight wires and in solenoids. 2. Describe the effect on the magnetic field of changing the magnitude and direction of the current. 3. Describe applications of the magnetic effect of current, including the action of a relay.
  • 14.5 Force on a currentcarrying conductor 1. Describe and interpret an experiment to show that a force acts on a current-carrying conductor in a magnetic field, including the effect of reversing: • the current • the direction of the field. 2. State and use the relative directions of force, field and current.
  • 14.6 D.C. motor 1. Describe the turning effect on a currentcarrying coil in a magnetic field. 2. Relate this turning effect to the action of an electric motor. 3. Describe the effect of increasing (a) the number of turns in the coil (b) the current.