Red Seal Electrician Practice
DC circuitsQuestion 688 of 1506

Two points in a circuit are joined by a plain wire. What is the voltage between the two points?

  1. Equal to the supply voltage
  2. Zero volts
  3. Half the supply voltage
  4. It depends on the wire length
Show answer

Correct answer: Zero volts

Points joined by a wire are electrically common. They are at the same potential, so no voltage can exist between them.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 6.2: Kirchhoff’s Voltage Law (KVL)

Practice dc circuits

Questions last reviewed: 18 October 2026