A relay is superior to a mechanical switch because it _______________?
Correct answer: C. Combines control with power amplification
- A. Is relatively inexpensive
- B. Does not require moving contacts
- C. Combines control with power amplification
- D. None of the above
Explanation
A relay lets a low-power control circuit operate a separate higher-power load, providing switching gain and often electrical isolation. Its contacts are mechanical, so the claim that it needs no moving contacts is incorrect.
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