Inductance (D+20)

  D+20+0 Energy stored in large coil with soft iron core flashes bulb.
  D+20+2 LR time constant: Square wave drives series LR on oscilloscope.
  D+20+4 AC dimmer: Soft iron core in coil dims lamps.
  D+20+5 Applet: Circuit Construction Kit (AC+DC), Virtual Lab
  D+20+10 Applet: Molecular Expressions Electricity and Magnetism
  D+20+15 Applet: Inductance