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Ohm law

  1. Jul 23, 2009 #1
    how do i go about answering this question guys, send me in the right direction please :)

    "when a diode allows a positive current to flow it has a resistance of 0.5kohms. It does not allow negative flow, i.e. the resistance is infinate. using ohms law, sketch a graph of current I against voltage V for both negative and positive values."

    i knw that ohms law states that the potential different is directly proportional to the current flowing throught the system providing the temperature remains constant, how do i find the values for I and V to use for my graph :)
     
  2. jcsd
  3. Jul 23, 2009 #2

    berkeman

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    Staff: Mentor

    What is the equation that relates V and I in terms of R? Plot that for the two separate regions, V>0 and V<0.
     
  4. Jul 23, 2009 #3

    jgens

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    Gold Member

    I don't think that you need them but perhaps I'm misinterpreting the question. We know that if a positive current flows then R = 0.5 k(ohms), regardless of the voltage (if V > 0) or the current. Using what you know about the resistance and ohm's law V = IR you should be able to draw a suitable graph.
     
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