In a parallel circuit, if you open one branch, the other branches continue to operate.

Prepare for the Southeast Lineman Training Center Exam with quizzes and detailed explanations. Enhance your skills and knowledge through interactive tests. Get exam-ready!

In a parallel circuit, each load is connected across the same two reference points, so every branch sees the same supply voltage and operates independently of the others. If you open one branch, you simply remove that path for current in that branch, but the remaining branches are still connected across the source and will continue to have current and operate. The total current drawn from the source drops by the amount that was flowing through the opened branch, while the other branches keep their operation intact. With an ideal, stiff voltage source, the voltage across the remaining branches stays exactly the same; even with a real source, the other branches generally continue to operate, though there might be a slight change in voltage due to the source’s internal resistance. So the statement is true.