This lesson covers the concept of self and mutual inductances of coupled coils. It explains how two coils can be linked with a common magnetic circuit and how the mutual inductance between them can be depicted. The lesson also introduces the dot convention, which is used to show the instantaneous polarities of the primary and secondary side voltage. It further discusses how a time varying current can induce voltage across the secondary terminals. The lesson concludes with the explanation of how to write the KVL equation of the primary and secondary side and how to simplify these equations to get an equivalent circuit.

- The steady-state performance analysis of machines is crucial in understanding their operations.
- Equivalent circuits are used to predict the performance of a particular machine.
- The concept of inductance plays a significant role in the operations of electrical machines.
- Mutual inductance is a key concept in understanding the interactions between two or more coils sharing a common magnetic circuit.

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