Inductive Reactance

Thread Starter

alexander7

Joined Oct 11, 2009
4
What alternating source voltage frequency is required to generate an inductive reactance of 10Ω in a 4 mH inductor?


An Unknown inductor is wired to a source voltage alternating with a frequency of 120 HZ. Find the inductive reactance of the inductor if there are 240 mA of current flowing through it and 1.44 X 10-4 joules of potential energy stored inside its magnetic fiel.:confused:
 

ATM

Joined Oct 8, 2009
31
1. xL = 2piFL, we need to find the frequency, so we rearrange the equation to find f:

f = xL / 2piL
f = 10 / 2*pi*(4x10^-3)
f = 387.89Hz

2. For this question, you need to use the equation Energy = 0.5*L*I^2. Rearrange to find inductor value L. Then use the equation for number one to find its reactance.
 
Top