A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a x V 50Hz sinusoidal supply. The current in the circuit is 8.2A. Calculate the value of x.(a) 10V(b) 50V(c) 100V(d) 120VI had been asked this question during an online exam.My query is from Resistance and Inductance in Series in section Single Phase Series Circuits of Basic Electrical Engineering

A resistance of 7 ohm is connected in series with an inductance of 31.

1.	A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a x V 50Hz sinusoidal supply. The current in the circuit is 8.2A. Calculate the value of x.(a) 10V(b) 50V(c) 100V(d) 120VI had been asked this question during an online exam.My query is from Resistance and Inductance in Series in section Single Phase Series Circuits of Basic Electrical Engineering
Answer» The correct CHOICE is (C) 100V To explain: XL=2πFL= 10 ohm.Z^2=(R^2+XL^2) Therefore, the total impedance Z = 12.2ohm. V=IZ, therefore V = 12.28.2 = 100V.

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