Lorenz’s law teaches that there is an induced voltage (v) in a circuit, or part of it, whenever the magnetic fl ux (f) varies with time (v = −df/dt). Magnetic fl ux is proportional to the electric current (i) that generates it (f ∼ i). Therefore, the induced voltage can also be proportional to a current variation (v ∼ di/dt). Clearly, the constant of proportionality between v and di/dt is a circuit parameter. For a voltage induced at a circuit position through which it is circulating a current varying with time, the constant of proportionality is known as self-inductance (L1). Of course, another circuit position may have a different self-inductance (L2). In addition, a current variation at a circuit position (e.g., at L1) can induce a voltage into another (e.g., at L2), and vice versa. In this example, the circuit parameter is the mutual inductance (M), being equal to each other in both cases, i.e., the mutual inductance from L1 to L2 is equal to that from L2 to L1. Moreover, the value of mutual inductance is proportional to the geometric mean of the self-inductances involved. For instance, the mutual inductance between L1 and L2 is proportional to LL 12 ⋅ . The maximum value of M, in this example, can be demonstrated to be M L L =⋅ 12 (tightly coupled self-inductances), while the minimum is zero (completely uncoupled selfinductances). Thus, a coeffi cient of coupling (k) ranging between zero and one (0 ≤ k ≤ 1) can be defi ned, so that M k L L =⋅ 12. In fact k, and consequently M, incorporates factors such as the relative distance and orientation between the involved parts. The mutual inductance properties are usually derived using electromagnetic theory, or considerations about the stored energy.1–4 However, the mutual inductance is a circuit parameter, and its properties are intimately linked to those of the selfinductances involved.1–4 This indicates that, in principle, it should be possible to derive the mutual inductance properties using electric circuit analysis tools, relating M to the self-inductances. The aim of this paper is to present the derivation of mutual inductance properties using electric circuit analysis tools. This approach may be useful in circuit analysis courses, because it allows the lecturer to present mutual inductance concepts while analysis tools are being taught.