Physics Dept. Demonstration Manual

DEM49 - Transformer Kit


To demonstrate the effects of changing the 'turns ratio' between primary and secondary windings of a transformer.

  • OHP voltmeter, AC
  • model transformer (EM12)
  • 400 winding inductor
  • 1600 winding inductor
  • power supply (S4-C)


Assemble all components on the OHP, except the power supply. Apply about 4 V AC and measure primary and secondary voltages with the OHP meter. Proceed as in DEM49A, method I, then reverse the primary/secondary connections and re-measure the voltages.