AC1 Fundamentals Unit 5 – Transformers
Exercise 2 – Mutual Inductance
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to demonstrate mutual inductance by
using a typical transformer. You will verify your results with an oscilloscope.
DISCUSSION
- Mutual inductance between windings of a transformer only occurs when the applied voltage
is changing. An ac voltage source will induce a voltage in the secondary winding, but a dc
voltage will not. - Introducing a switch between dc source and a transformer primary allows the voltage source
to be pulsed on and off. Pulsing the source on and off produces sudden changes in the applied
current. These changes cause the magnetic field surrounding the primary winding to expand
and collapse. - Fluctuations in the magnetic field surrounding the primary coil induce a voltage in the
secondary coil.