Diodes and resistance

  1. I was learning about how diodes work , I read on some sites that diodes have a very low resistance in forward and very big resistance on backward. I read on other sites that diodes allow current in one direction only and no current in the other . So which is right , they 're not the same thing ( big resistance = small current and not no current at all )
     
  2. jcsd
  3. SteamKing

    SteamKing 8,597
    Staff Emeritus
    Science Advisor
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    The ideal diode would have zero resistance in the forward direction and infinite resistance in the backward direction. Since diodes are fabricated from real materials, these ideal resistance properties can only be closely approximated.

    http://en.wikipedia.org/wiki/Diode

    This article shows the I-V characteristics of a typical p-n junction diode (Figure 5).
     
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