Electromagnetic Induction

  1. Principles of Electromagnetic Induction
  2. A.C. Generator
  3. Transformer
Students should be able to:
  1. deduce from Faraday’s experiments on electromagnetic induction or other appropriate experiments:
    1. that a changing magnetic field can induce an e.m.f. in a circuit
    2. that the direction of the induced e.m.f. opposes the change producing it
    3. the factors affecting the magnitude of the induced e.m.f.
  2. describe a simple a.c. generator (rotating coil or rotating magnet) and the use of slip rings (where needed)
  3. sketch a graph of voltage output against time for a simple a.c. generator
  4. describe the structure and principle of operation of a simple iron-cored transformer as used for voltage transformations
  5. recall and apply the equations $\dfrac{V_P}{V_S} = \dfrac{N_P}{N_S}$ and $V_PI_P = V_SI_S$ to new situations or to solve related problems (for an ideal transformer)
  6. describe the energy loss in cables and deduce the advantages of high voltage transmission.