alleryThe effective value of an alternating current is called its:
ARoot mean square
BPeak to peak sum
CAverage deviation
DTotal resistance
Answer & Solution
Correct answer: A. Root mean square
1. An alternating current keeps reversing direction.
2. Its simple average over a cycle is zero.
3. The useful measure is the root mean square value.
4. So the answer is root mean square.
_Source: syllabus Physics, Ch 7 'Alternating Current'_
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