For semiconductors, the current (I) vs. voltage (V) relationship is as shown in the picture below.
As we increase the applied voltage, the electron-hole pairs generate increases too, so we see an almost linear increase in current.
Now if we consider metals, how will current behave if we increase voltage? Metals are full of electrons, so on increasing V, will it have any effect on I at all? I feel, the curve might be like this:
Is it correct?