Primary and Secondary Coils - SE-8653A



The secondary coil slides over the primary coil, and the soft iron core slides into either or both, providing a look at magnetic induction and transformer theory. This rugged device is sensitive enough to be used with voltmeters instead of galvanometers. The coils are wound around hollow wooden cores, with a turns ratio of approximately 12 to 1. The primary coil is mounted on a wooden stand.


Outer Coil
  • 2920 Turns
  • Length: 11 cm
  • Inner Diameter: 2 cm
Inner Coil
  • 235 Turns
  • Length: 12 cm
  • Inner Diameter: 1 cm
Soft Iron Core
  • 0.96 cm diameter
Ratio of turns
  • 12.4:1
Ratio of voltage
  • approximately 10:1