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    This feels like a stupid question, but when the potential difference is 0 or anything below that, what is the resistance of the diode. Initially I thought it would be zero but then that can't be the case, so would it be infinite?
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    (Original post by AtomicCow)
    Name:  IVGraphDiode.png
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    This feels like a stupid question, but when the potential difference is 0 or anything below that, what is the resistance of the diode. Initially I thought it would be zero but then that can't be the case, so would it be infinite?
    Yes. An idealised diode passes current in one direction and not the other.

    i.e. the ideal diode has infinite resistance in the reverse biased case and zero resistance in the forward biased case.

    In reality diodes are never ideal as shown by the graph.
 
 
 
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