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

Dynamic resistance

  1. Mar 30, 2009 #1

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    I'm confused about dynamic resistance.

    The definition I've seen is Rd = dV/dI.

    Is it also ok to write it Rd = d(IR)/dI, so that Rd = R + I dR/dI ?

    I couldn't find a straightforward definition for dynamic resistivity at all …

    is it ρd = d(Iρ)dI = ρ + I dρ/dI ?
     
  2. jcsd
  3. Mar 30, 2009 #2
    Dynamic resistance is dV / dI. It is often used to refer to the dynamic forward resistance of a diode junction, or the dynamic resistance of a zener diode junction.
     
  4. Mar 30, 2009 #3
  5. Mar 30, 2009 #4

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    If RD = dV/dI, then a reasonable definition for dynamic resistivity would be
    ρD = dE/dJ,​

    where E is electric field and J is the current density.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Dynamic resistance
  1. Battery and resistance (Replies: 2)

  2. Resistance and frequency (Replies: 28)

Loading...