Choose the bottom node as ground. Two essential nodes remain.
Below is a complete, ready-to-publish blog post. If you’re an electrical or computer engineering student, you’ve likely encountered the gold-standard textbook: Electric Circuits by James W. Nilsson and Susan Riedel. The 11th edition continues to set the bar for clear explanations, real-world examples, and challenging end-of-chapter problems. electric circuits 11th edition 解答
i_x = (v_A – v_B) / 4kΩ