Red Seal Electrician Practice
Wiring and componentsQuestion 658 of 1506

Two wires are fastened under the same screw of a terminal strip bar. How are they related electrically?

  1. They are in series, with a voltage drop between them.
  2. They are insulated from each other by the bar.
  3. They are in parallel, with equal current in each.
  4. They are electrically common to each other.
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Correct answer: They are electrically common to each other.

The wires under one screw, or under screws on the same bar, are joined by the metal bar.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 5.8: Building Simple Resistor Circuits

Practice wiring and components

Questions last reviewed: 18 October 2026