Why Can't Ohm's Law Be Applied Here?

[songoku]

Homework Statement

Given I = Io (exp (V/Vo) -1), Io = 1 A, Vo = 1 V, R = 1 ohm
(i) Find R when V = 5 Volt
(ii) Find R when V = 10 Volt
(iii) Plot the graph of V vs I
(iv) Explain why the Ohm’s law can’t be applied

Homework Equations

V = I*R

The Attempt at a Solution

(i) Subs. to the equation given, i got I = (e^5 ) - 1. Then R = V / I = 5 / [(e^5 ) - 1] ohm

(ii) Use the same method as (i), I got R = 10 / [(e^10 ) - 1] ohm

I'm not sure I can use V=I*R, but I don't know the other way to find R


(iii) the graph will be exponential curve similar to y = e^x

(iv) The Ohm's law can't be applied because the relation between V and I is not linear.


Do I get it right?

Thanks

 

[rl.bhat]

Even in a non-ohmic circuit, you can the ohm's law at a particular instant.

 

[songoku]

Hi Mr. rl.bhat

Ok then I think my answers are right. Thanks