RMS Value of a Square Wave Current – Rankers Physics
Topic: Alternating Current
Subtopic: Average Current and RMS Current

RMS Value of a Square Wave Current

A square wave current switching rapidly between \(+0.5\) ampere and \(-0.5\) ampere is passed through an A.C ammeter. Then the reading shown by it, is
0.25 ampere
0.5 ampere
\(\frac{0.5}{\sqrt{2}}\) ampere

\(0.5 \times \sqrt{2}\) ampere

Solution:

An AC ammeter measures the RMS value of the current. For a symmetric square wave of amplitude \(I_0\), the RMS value is equal to its peak value, \(I_{rms} = I_0 = 0.5\text{ A}\).

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