He looked back at the book, specifically the chapter on . He had forgotten the capacitors. In the rush to fix the resistance, he had ignored the transient response. The sudden surge of current when the switch flipped was causing a spike—a transient voltage that the textbook warned about in the sections on first-order and second-order circuits.

| Common Pitfall | How the Book’s PDF Solves It | | :--- | :--- | | Losing sign conventions (KVL) | Their sign convention box is highlighted in yellow in the PDF; keep it bookmarked. | | Confusing series vs. parallel | Chapter 2’s visual flowchart is a quick-reference tab. | | Mistakes in nodal analysis (supernodes) | Example 3.4 provides a color-coded step breakdown. | | Forgetting the difference between impedance and reactance | The AC chapter includes a summary table on page 2 of that section. |

As Emma began to read the book, she learned about the fundamental concepts of network theory, including: