- #26

gneill

Mentor

- 20,875

- 2,838

The diode has resistance RRight, the diode has no resistance. We only have the resistance of the R_{D}.

_{D}when it is conducting.

You already had R from the first case. You were looking for RFirst graph has 40 Ω. Second has 20 Ω as net resistance. And since we have 1 / 20 = 1 / 40 - 1 / R so R = 40 Ω. Like this?

_{D}in the second case. But the same math applies, and you have in fact found R

_{D}.