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Electricity and magnetism


After this lesson, you should be able to:

  • Explain the advantages of alternating current
  • Write expressions for current and voltage in an AC circuit
  • Define the rms values for current and voltage and explain their usage
  • Know that the average power is given by Pav = Irms Vrms = ½ Imax Vmax
  • Draw graphs of voltage versus time and current versus time for an AC circuit
  • Solve problems using the concepts Pav, Irms and Vrms