An alternating current is that which:
Correct answer: C. Reverses its direction several times per second
- A. Flows intermediately
- B. Varies in magnitude
- C. Reverses its direction several times per second
- D. None of the above
Explanation
An alternating current (AC) reverses its direction multiple times within a given period, typically measured in Hertz (Hz). This periodic reversal distinguishes AC from direct current (DC), which flows steadily in one direction. AC is widely used for electricity distribution due to its ability to be easily transmitted over long distances and transformed to different voltage levels using transformers.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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