Automotive Electrical and Electronic Systems Classroom Manual Fifth Edition Update by John F. Kershaw

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Magnetism 69
measure of electromagnetic field strength. The unit
of measure used for mmf is ampere-turns. The
principle of a transformer can be summarized by
describing it as flowing current through a primary
coil and inducing a current flow in a secondary or
output coil.
Electromagnetism can also generate electromagnetic
interference (EMI) and radiofrequency
interference (RFI). Such interference can disrupt
radio and television signals, as well as electronic
system signals. Many devices are used to suppress
this interference in automotive systems.