An inductor has an impedance of 31.0 Ω and a resistance of 20.5 Ω at a frequency of 47.5 Hz. What is the inductance? (Model the inductor as an ideal inductor in series with a resistor.)? (in mH)
Impedance Z √(R? + X??) 31? 20.5? + X?? X? 23.25 ohms X? 2πfL 23.25 2π(47.5)L L 0.0779 H or 78 mH .
