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I-V graph of Diode under C.R.O.

  • Thread starter cloudone
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1. Homework Statement
In all physics textbooks, the V-I graph for diode appears like the followings
http://211.233.39.205/phpBB2/forum_img/diode/diode-14.gif
However, when I conducted the experiment with a 1N4001 diode and 12V-AC, similar graph was found, the the graph seemed to have reflected along the y-axis.

2. Homework Equations



3. The Attempt at a Solution
sorry people, but I have no idea why it is this way. Since the x-axis should represent the voltage supplied.

What I'm thinking is that the x-axis is in the opposite direction on a C.R.O., which means more positive towards the left and more negative towards the right. Is that how a CRO works?
 
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