What rms current flows in a 60-mH inductor when 120-V rms ac at a frequency of 20 kHz is applied to it?
A)8.0 mA
B)16 mA
C)24 mA
D)32 mA

Question

Quizplus · Accepted Answer

The impedance of the inductor can be calculated as follows: 
XL = 2πfL = 2π(20,000 Hz)(60 mH) = 7.53 Ω

The rms current flowing through the inductor can be calculated using Ohm's law: 
I = V / XL = 120 V / 7.53 Ω = 15.92 mA

Therefore, the best choice is B, 16 mA (rounded to two significant figures).

What Rms Current Flows in a 60-MH Inductor When 120-V