everyday science MCQ #49460

Which statement correctly distinguishes AC from DC electric current?

everyday science MCQ #49460

  1. Question 1

    Q1. Which statement correctly distinguishes AC from DC electric current?

    • A) AC periodically reverses direction while DC flows in one constant direction
    • B) AC flows in one direction while DC reverses direction periodically
    • C) AC is used in batteries while DC is used in power grids
    • D) AC has higher voltage than DC in all applications

    Answer: AC periodically reverses direction while DC flows in one constant direction

    Explanation: Alternating current (AC) reverses polarity at a fixed frequency (50 or 60 Hz in power grids); direct current (DC) flows in one constant direction, as produced by batteries. AC is used in power grids because it is easily transformed to different voltages.