Error analysis of electromotive force measurement of primary battery

In fact, there are many ways to measure the electromotive force and internal resistance of power supply, so I'll say the one in the textbook. For this experiment, under the condition of a certain circuit diagram, try to choose an accurate circuit diagram (the following figure is correct, so it is important to pay attention to the position of ammeter connection). The main sources of error are ammeter and voltmeter. When talking about the principle, they are said to be ideal ammeters, but they are not, so we should consider internal resistance!

Now upload the picture and analyze it for you by image method, because it is easier to understand and more accurate!

Ask again if you don't understand! Hope to adopt! !