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I just need to find the current, power, and voltage for 3 conditions.

a) when in full sunlight

b) when 1 cell is in shade

c) when 2 cells are in shade.

my question is:

I know the voltage to be 20 volts in full sunlight and 19.5 volts when 1 cell is in shade....so when 1 cell is in shade I noticed the book saying that one .5 volt cell will now act as a 5 ohm reisistor.....is this true....and why?

and if that is the case for 1 cell in the shade would I have a total of 10 ohms resistance to calculate the current flowing?