Red Seal Electrician Practice
Motor controlsQuestion 108 of 1506

In a ladder diagram, several contacts are labelled with the same name, for example "A". What does that mean?

  1. They are all operated by the same switch or relay
  2. They are all on the same rung of the ladder diagram
  3. They carry the same current in the circuit
  4. They are all wired as normally open contacts
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Correct answer: They are all operated by the same switch or relay

The label links a contact to its actuating device.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 6.2: Digital Logic Functions

Practice motor controls

Questions last reviewed: 18 October 2026