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Homework Help: Voltage and Current Graph

  1. Apr 21, 2005 #1
    I had to draw a Current vs Voltage graph, and they were both proportional and linear.
    i just need help with these questions : what mathematical relationshop (proportionally) does the graph demonstrate between voltage and current?

    What do the slopes represent?

    pretty easy questions.
     
  2. jcsd
  3. Apr 21, 2005 #2
    V=IxR (ohms law) If you graph I vs V the slope is 1/Resistance
     
  4. Apr 21, 2005 #3
    i know what your talking about, but i cant remember exactly how it goes, but your talking about the 3-d graphs correct?
     
  5. Sep 10, 2005 #4
    the relationship between voltage and current is V = IR, where R is resistance. So R is the proportionality constant. Now, divide by R on both sides to get V/R = I. Now, 1/R if the proportionality constant. 1/R is also known as conductance and is represented by the letter G.

    Keep in mind that voltage and and current are only linearly related within a certain voltage range, where this voltage range depends on the circuit element in question. Then weird more complicated relationships occur. The power rating of an element describes this voltage/current range.
     
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