#### Abstract

The purpose of this note is (i) to point to a reference missing in the paper (Mayo-Maldonado et al., 2018) and (ii) to show that some of its content is covered in a more general setting by the results in that reference (Göknar, 1972).

#### 1. Introduction

As explained in the sequel, some of the results developed for specific circuits in Sections 5 and 7 of the paper given in [1] can simply be obtained as applications of results in [2] presented for arbitrary passive circuits containing inductor only cut-sets and/or capacitor only loops.

#### 2. Comments

**With Theorem ****1** (typo, first Theorem 2 should be Theorem 1) in [2], a measure for the jump in energy is given for a general circuit consisting of inductors (L) and/or capacitors (C) at a time of discontinuity and shown to be positive.

**With Theorem ****2** for a nonsingular L (C) matrix, it is shown that the necessary and sufficient condition for the jump in energy to be zero is that L currents (C voltages) satisfy Kirchhoff Laws before the jump (at ) [2].

In case of a singular L (C) matrix,** Theorem ****3** gives a necessary and sufficient condition for the energy at to be zero showing how essential is the nonsingularity of L (C) matrix.

Thus there is no need for all the lengthy derivations for a circuit consisting of two capacitors in** Section ****5**** of paper [1]**; they can all be derived simply from the general formulation in [2].

For a circuit* N* consisting of inductors (capacitors) only, an** augmented circuit ** is obtained from* N* by including resistors into* N* in such a way that all L cut-sets (all C loops) are destroyed and when all resistors are open (short) circuited the topology of* N* is obtained.

**Theorem ****4**** in** [2] shows that all L currents (C voltages) in tend to L currents (C voltages) in* N* as . Furthermore, the fact that the energy jump in* N* is equal to the energy consumed on the interval in the resistors of is demonstrated in** Theorem ****5** [2], giving a physical interpretation to the energy jump in* N*.

It is expected that results in Section 7 of paper [1] can profit from Theorems 4 and 5 of [2].

#### 3. Conclusions

Referring to paper [2] will do justice to it and profiting from its results may shorten the paper [1]. Also, it is quite possible that these results open new horizons for developing further outcomes.

#### Conflicts of Interest

The author declares that he has no conflicts of interest.