Red Seal Electrician Practice
DC circuitsQuestion 371 of 1506

Why does polarity matter when connecting some meters and motors?

  1. These devices will not work on any AC supply
  2. These devices need a much higher operating voltage
  3. These devices need a separate ground wire to work
  4. These devices depend on the direction of current flow
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Correct answer: These devices depend on the direction of current flow

Polarity-dependent devices must be connected correctly.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 2.5: Polarity and direction of current flow

Practice dc circuits

Questions last reviewed: 18 October 2026