I am a high school student and I am very confused in how battery's and electricity actually works?
My question is: suppose we have an ideal battery, we know as soon as we switch on the DC circuit, a transient current will start to flow and at this moment the current at different parts of the circuit will be different and charges will be depleting and accumulating on different parts, so at this moment the charges leaving the battery and entering the battery would be different and it would only be equal when steady state is reached. So shouldn't the potential difference of the battery get changed because until steady state the charges leaving and entering battery weren't same? In high school Textbooks,it's written that the charges entering and leaving the battery would be same because battery's potential difference is maintained ( the electrons leaving from the Zn rod will end up at the copper rod) but it seems like a flawed statement, battery's doesn't have their own brain. How do they 'know' that at all the time they have to maintain the potential difference?How can the same no. Of charges per unit time will end up at copper rod at all the moment, this should only happen at steady state and this even an ideal battery's potential should change a bit?