Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Henrys (Inductance)

  1. Oct 14, 2007 #1
    I read that the unit of inductance is the measure of the time it takes for a current to fully establish itself through the inductor.

    Is the reason it takes longer in some inductors for the current to establish itself because it creates a greater magnetic flux? Can the henry also tell you the intensity of the magnetic field produced in an inductor? Obviously a coil with 10 turns is going to have a greater magnetic flux than one with 5 turns. If I took the iron core out of the 10 turn coil would the current flow faster because there would be less back EMF? Is that the idea behind it? Wouldn't it be easier to measure an inductors inductance by measuring the magnetic flux created when current flows through it?

    Have I got the right idea of the henry or am I mixing something up?
    Last edited: Oct 14, 2007
  2. jcsd
  3. Oct 15, 2007 #2


    User Avatar

    Staff: Mentor

    You have the basic ideas correct. And the L value is generally easiest to measure by putting an AC voltage across the inductor, and measuring the resulting current. Measuring the flux directly is a more difficult physical problem.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook