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1. Two identical cells connected in series send 10 amp current through a \(5\ \omega) resistor. Wen they are connected in parallel, they send 8 amp current through the same resistance. What is the internal resistance of each cell?
2. The Kirchhoff’s first law \(\sum i=0\) and second law \(\sum iR=\sum E\) , where the symbols have their usual meanings, are respectively based on: