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(D) An $AC$ ammeter is designed to measure the root-mean-square $(RMS)$ value of an alternating current.In contrast,a $DC$ ammeter is designed to meas

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zero

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(D) An $AC$ ammeter is designed to measure the root-mean-square $(RMS)$ value of an alternating current.In contrast,a $DC$ ammeter is designed to measure the average value of current over a complete cycle.For a sinusoidal alternating current,the average value over one complete cycle is defined as $I_{avg} = \frac{1}{T} \int_{0}^{T} I_{0} \sin(\omega t) dt = 0$.Since the $DC$ ammeter measures the average current,it will show a reading of zero.

In an $AC$ circuit,when an $AC$ ammeter is connected,it reads $i$ current. If a student uses a $DC$ ammeter in place of the $AC$ ammeter,the reading in the $DC$ ammeter will be:

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