This lesson covers the concept of coupled coils and their self-inductance, represented by L1 and L2. It explains the mutual inductance between the coils, denoted as M, and the number of turns N1 and N2. The lesson further elaborates on how self-inductance can be expressed in terms of leakage inductance and mutual inductance. It also discusses the derivation of the equivalent circuit using Kirchhoff's Voltage Law (KVL) equations for both primary and secondary coils. The lesson concludes with the interpretation of the equivalent circuit of a transformer referred to the primary.

- Self-inductance can be expressed in terms of leakage inductance and mutual inductance.
- The equivalent circuit of a transformer can be derived using KVL equations for both primary and secondary coils.
- The equivalent circuit provides a better physical insight into the functioning of a transformer.

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