Demountable Transformer - V Vs N - Oscilloscope


To demonstrate the effect of changing the number of turns in the secondary of a transformer.


Demountable transformer core with 250-turn primary coil, long wire with banana plugs, and oscilloscope on scope/TV cart.


Setup Time

5 min.




    Use the variac to put 75VAC at 60 Hz onto the primary coil of the transformer. The secondary coil is created by looping a wire around the transformer core and connecting it to the AC voltmeter. The voltage produced is proportional to the number of turns in the secondary coil - 3 VAC RMS for 10 turns, which is approximately 10 volts peak-to-peak on the oscilloscope.


    Joe L. Ferguson, Turn By Turn Transformer Demonstration, TPT 17, 59, (1979).