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Resistance of a Series Resistor

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A permanent-magnet moving-coil milliammeter, having a resistance of 15 Ohm and giving full-scale deflection with 5 mA, is to be used with bridge-connected rectifiers and a series resistor to measure sinusoidal alternating voltages. Assuming the forward resistance of the rectifier units to be negligible and the reverse resistance to be infinite, calculate the resistance of the series resistor if the instrument is to give full-scale deflection with 10 V (r.m.s).

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The expert examines resistance of a series resistors.

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For 10 V rms voltage input, the corresponding peak voltage V0 = sqrt(2) Vrms = sqrt(2) x 10 = 14.14 V
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