V-I graph ka slope internal resistance deta hai, bhai. Par mujhse seekha hai ki graph kabhi perfect straight line nahi banta — meri chhoti solar cell se data leke jab maine plot kiya, to intercept bhi bohot shift ho raha tha. Mera khud ka experience yeh hai ki theory sahi hai, par practical mein light aur battery ki condition se slope change ho jata hai, isliye main do-tin baar average nikalta hoon. Yeh maine tab seekha jab apne power bank ke liye purani mobile batteries recycle kar raha tha.
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