A current source of 2 mA has an internal resistance of 20 MΩ. Current source is stiff, when the load resistance is from ___________.

Concept:

A stiff current source is defined as one whose internal resistance is 100 times more than load resistance R_L
R_S > 100 R_L

Calculation:

Given;

R_S = 20 MΩ 

Then;

    R_S > 100 R_L

⇒ R_L<R_S/100

∴ R_L< (20× 10⁶)/100 = 200 KΩ 

Hence, the load resistance should be from 0 to 200 kΩ.