Which of the following are integrating instruments ?
Correct answer: D. Ampere-hour and watt-hour meters
- A. Ammeters
- B. Voltmeters
- C. Wattmeters
- D. Ampere-hour and watt-hour meters
Explanation
Ampere-hour and watt-hour meters integrate current or power over time, giving total charge or energy delivered. Ordinary ammeters, voltmeters, and wattmeters normally indicate instantaneous values.
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