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Alternating current measured in a transmission line will be(a) Peak value(b) Average value(c) RMS value(d) ZeroI had been asked this question in an online interview.Asked question is from Conductors in section Electric Fields in Material Space of Electromagnetic Theory

Answer»

Correct option is (C) RMS value

To explain I WOULD say: The INSTANTANEOUS CURRENT flowing in a transmission line, when measured using an ammeter, will give RMS current value. This value is 70.7% of the peak value. This is because, due to oscillations in AC, it is not possible to measure peak value. Hence to normalise, we consider current at any time in a line will be the RMS current.



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