Calculating Inductance

Discussion in 'Homework Help' started by Steve1992, Aug 1, 2006.

  1. Steve1992

    Thread Starter Senior Member

    Apr 7, 2006
    Ive been using complex numbers and my scientific calculator to great
    success as shown in this sites tutorial. I like the why I can just use ohms law, as with DC analysis.

    But how do I calculate the inductance without going back to trig.

    Parallel R-L ac circuit:
    "Resistor 40R;
    Supply 200V, 50Hz
    Supply current is 8A.
    Inductor, L?

    Whats the inductance of the coil, L?"
  2. beenthere

    Retired Moderator

    Apr 20, 2004

    No Trig, just simple algebra.

    I = E/R, using the 40 ohm resistor, will give you something other than 8 amps. R = E/I will give you the resistance of the paralleled resitor and inductance. Figure the correct resistance to parallel with 40 ohms that give the 8 amps of current. Then, using L = RL/2piF, you have the inductance.