 #1
Summary:
 If we plot logI against V for a diode we get a straight line, but what does that mean?
Hello there,
I've been working through a task (that doesn't have an answer sheet or explanation) in which we plot I against V for three different diodes. Each has a different threshold voltage and displays the usual charcteristic curve. The final question is this:
"It is suggested that the behviour of a diode is logarithmic. Plot a graph of I against V using a base 10 logarithmic scale for the current axis. Discuss whether your graph supports this suggestion."
So, if you do this for the data given you get three straight lines with similar gradients. So I'd say 'Yes, this behaviour appears to be logarithmic'.
But, what does this mean? What is the physical significance? What else can we look at that 'grows logarithmically'? How does this compare to exponential growth, perhaps?
Any help or suggestions are welcome :)
~Owls
I've been working through a task (that doesn't have an answer sheet or explanation) in which we plot I against V for three different diodes. Each has a different threshold voltage and displays the usual charcteristic curve. The final question is this:
"It is suggested that the behviour of a diode is logarithmic. Plot a graph of I against V using a base 10 logarithmic scale for the current axis. Discuss whether your graph supports this suggestion."
So, if you do this for the data given you get three straight lines with similar gradients. So I'd say 'Yes, this behaviour appears to be logarithmic'.
But, what does this mean? What is the physical significance? What else can we look at that 'grows logarithmically'? How does this compare to exponential growth, perhaps?
Any help or suggestions are welcome :)
~Owls
Attachments

18.8 KB Views: 24