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Alternating Current — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current1 Mark
MCQ
Alternating current is one which changes in its:
  • A
    direction
  • B
    magnitude
  • C
    magnitude and direction both
  • D
    none
✓

Answer

  1. magnitude and direction both

Explanation:

An alternating current (AC) is an electric current whose magnitude and direction vary, unlike direct current, whose direction remains constant.

The usual waveform of an AC power circuit is a sine wave, because this leads to the most efficient transmission of energy. The sine wave oscillates periodically between positive and negative direction.

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