Below there are two circuits supplied by a 10V supply. The only difference is the one on the left is 10k in series with 1k; and the one on the right is 10k in series with a diode.
Confusion 1 about circuit (A):
If the resistor is heated its resistance increases. And if the current would remain the same we would say that the voltage across the resistor would increase. But the current will not remain same because the total circuit resistance increase will decrease the current. Will the voltage across the 1k resistor increase or decrease? Which one will dominate? Increase in resistance or the decrease in current?
If the temperature of the resistor increases resistance increases and this yields current decreases according to Ohm's law V = R * I. R is increasing and I is decreasing. In a practice which one dominates and what happens to the voltage across the 1k resistor?
Confusion 2 about circuit (B):
If the diode is heated its DC resistance decreases. If the current would remain the same the voltage across the diode would also decrease. But since the circuit current will increase I'm again facing the same difficulty here. The diode DC resistance is decreasing which immediately should increase the circuit current. Again something is very cloudy for me to decide what happens to the voltage across the diode when it is heated in practice. Which one will dominate? Increase in current or decrease in DC resistance? How can it be explained step by step manner?