Hi, everyone. Can someone please help me with this problem? How to draw the equivalent V-A characteristics of two diodes? Thanks, in advance!
Examples:

 

For sure we can help. But it will be better if you show as your attempt to solve this problem.

 

OK. This is what will happen from my deductions. Sorry I don't know how to use software to do graphics, and sorry that I don't have a scanner







PS Sorry again for the inconvenience.

 

Your V-A characteristics looks good. But why you reverse the voltage polarity in the second pic? Why not 15.3V on first quadrants and 1.4V on the third quadrants ?

 

Your V-A characteristics looks good. But why you reverse the voltage polarity in the second pic? Why not 15.3V on first quadrants and 1.4V on the third quadrants ?

Ooops. Yeah, you are right, my bad. Thanks for the posts.

 

Hi, I don't understand what the problem supposed to do.
Can anyone explain?
How the two first circuits and final circuit are possible?

 

Can you explain your question bit more? Because I don't understand you question.

 

Jony,
For example, in the second circuit, there are two zener diodes in series. One with 6.3V and the other is 9V. Why this circuit possible? I think there is a short circuit here.
I don't understand these circuits.

 

Well I don't see any "short" here. The task was to draw V-I characteristics on the plot.
Why you see a short? If you need to plot V-I for a single si diode you will also see a short?

 

I don't understand the circuit:

Why 6.3 V can be in parallel with 9V? Is this a short circuit?

 

This circuit act just like two diode connected in parallel.

 

I don't understand the circuit:

Why 6.3 V can be in parallel with 9V? Is this a short circuit?

These aren't batteries and the diodes aren't generating 6.3V and 9V. w

A normal silicon diode has about 0.7V across it when it is forward biased and conducting current, right?

A germanium diode has about 0.3V, right?

Let's say that you had a circuit that had both kinds of diode in it. You could write "Si" and "Ge" next to them (or a part number) to let you know which is which. But you could also write "0.7V" and "0.3V" next to them, right?

It's the same thing here. The "6.3V" and "9V" are simply labels telling you what the reverse biased voltage is when it is conducting in that direction.