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physics gcse ISA- solar cells HELP!!

hi, i need help in finding another alternative weaker method for my solar cell experiment i did. i will tell you a the method i did and the hypothesis of this experiment. ..

hypothesis: the output voltage from a solar cell depends on the area of the solar cell exposed to the light.

my method: i had a lightbulb and solar cells.i connected the solar cells to the multimeter and took the readings three times and found the average. I continuously covered up a 1cm of the solar cell, so the area of the solar cell decreased. i used black card to cover up the solar cell.

i need to find out another method. can you please help me :smile: