Question

    What is the main difference between alternating current

    (AC) and direct current (DC)?  
    A AC flows in one direction, while DC reverses direction periodically Correct Answer Incorrect Answer
    B DC flows in one direction, while AC reverses direction periodically Correct Answer Incorrect Answer
    C AC has a higher voltage than DC Correct Answer Incorrect Answer
    D DC is used in power transmission, while AC is used in batteries Correct Answer Incorrect Answer

    Solution

    Direct current (DC) flows in one constant direction.   Alternating current (AC) reverses its direction periodically.   AC is used for power transmission because it is easier to transform to different voltages.   DC is used in batteries, electronic circuits, and small devices.

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