I couldn't find anywhere what happens to the operation point of a PV cell, when, a resistance (load) connected straight up its output, changes (step) from one value to another. With other words, suppose A is the operation point under load R1 and B is the operation point under load R2. When we step change the load (from R1 to R2), how will the point A will eventually move to the point B?
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The load line (or red line) will 'rotate' from A to B. A resistive load line always has a center around the 0V,0A point of the graph and has a slope according to it's resistance. While it's doing that the loading point will follow the blue curve.

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