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Transformers are important examples of two port networks.
Transformers, of course, find wide application in
electrical engineering, and a key component
of the electric supply system.
Figure 62 shows the transformer
symbol, with current and voltage sign conventions.
Figure 62:
Transformer.
 |
- N1 and N2 are the numbers of turns in the left and
right coils, respectively.
- L1 and L2 are the self inductances
of the two coils.
- M is the
mutual inductance
of the coils (due to common flux linkage).
- The position of the dots indicates that the fluxes in the two
coils are assisting each other. If one of the dots was moved to
the bottom, then the fluxes oppose.
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