Ji Ke Lao Bai [Daily Q&A] For accuracy, is it better to connect in series or parallel? Still the same effect?

The student's question is as follows: In the
first two episodes of the 3.3V voltage divider resistor, the upper voltage divider resistor is two 100K. Why do you choose this?
200K resistors are also available, why not use 200K directly? For accuracy, is it better to connect in series or parallel? Still the same effect?

Teacher Bai Jilong's answer is as follows: The
reason why we consider using two 100K instead of 200K is mainly because of the technical considerations. Although the indication error is the same in theory, the actual indication error will be smaller when connected in series. In terms of accuracy, series and parallel connections are the same, but we are mainly connected in series. Considering the cost and circuit complexity, the temperature coefficient error is what really determines the accuracy.