First Question: Lets assume that I put a specific resistance to the fuel cell output. How can I find the operating point of the fuel cell? As I see it, neither the voltage, nor the current are stable. I also don't quite understand how can the voltage depend on the current being drawn. In classic circuits, one has a certain voltage and a certain resistance, and can then find the current (I=V/R).
(In the manual it says that when the load is zero (also current is 0) the voltage has its max value. When a load is connected, a current flows through it. This in turn should drop the voltage a bit, which would also cause a decrease in the current and so on..)
Second Question: I have read that to increase the power sent from the fuel cell, you need to increase "the load", or "the current drawn from the load". Assuming that I have only ohmic loads, how can I control the current flowing through my load? For example, lets say that I want 1000W to be given from the fuel cell. What should my load be in that case?