Ontario Grade 9 Science Class Practice Exam

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What is direct current?

  1. A flow of electrons in multiple directions

  2. A flow of electrons in no particular direction

  3. A flow of electrons in one direction through an electric current

  4. A static flow of electrons

The correct answer is: A flow of electrons in one direction through an electric current

Direct current (DC) is a type of electrical current that flows in one direction through an electric circuit. This means that the direction of the electron flow remains constant and does not change. Option A is incorrect because it implies that DC flows in multiple directions, while DC only flows in one direction. Option B is incorrect because it implies that DC has no particular direction, while DC always flows in one specific direction. Option D is incorrect because it uses the term "static flow," which is not a valid term for an electrical current.

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