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ASVAB Science and Tech Practice Questions

Category - Technology/Engineering

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DC voltage sources have a positive (+) terminal and a negative (-) terminal. Which of the following statements explains why AC voltage sources do not have positive and negative terminals?
  1. AC voltage at each terminal is always changing.
  2. AC current does not involve charged particles.
  3. AC current is safe and warning labels are not needed.
  4. AC voltage at each terminal is always higher than ground.
Explanation
Answer: A - AC voltage at each terminal is always changing.
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