In the book Sorena "electronics.Step by step" in editions 1986, 1991, 2001 there is a task where calculations need to be made 6 circuits according to Ohm's law. In the single chain calculations are not the same. If it's a typo, it was supposed to correct in the next publication, but it in all editions unchanged. Or is it specially made? Or I something do not consider? In Proteus, the calculations also differ from the book.