在做奥斯特的电流产生磁场或电磁铁等实验中,为了获得较好效果,需要通入导线较大电流,而电源又通常采用干电池供电,同样几节千电池,将它们串联还是并联,才能取得较大电流呢? 设干电池的节数为n,且为偶数,每节电池的电源电动势为~E,内阻为r,导线电阻为~R。当采用串联形 In experiments such as Oster’s current generation magnetic field or electromagnet, in order to obtain better results, it is necessary to pass a large current to the wire, and the power supply is usually powered by a dry battery. Similarly, several batteries are connected in series or in parallel. In order to obtain a larger current? Set the number of dry cells to n, and even, each cell’s power EMF is ~E, internal resistance is r, wire resistance is ~R. When in series