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K3-04. Demountable Transformer - V Vs N - Oscilloscope

Purpose

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

Equipment

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

Setup Time

5 minutes.

Images

k3-04

Description

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.

References

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

K. Electromagnetic Principles

K. Electromagnetic Principles

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