What happens to voltage across a thermistor when temperature increases?

Most things just called a “thermistor” exhibit decreased resistance with rising temperature. There are also such things as PTC (positive temperature coefficient) thermistors that exhibit the opposite effect. As you say, V = IR. If R goes down, the V will go down at the same I.

Why does the voltage increase when the resistance increases?

R=resistance In other words, the current is directly proportional to the voltage and inversely proportional to the resistance. So, an increase in the voltage will increase the current as long as the resistance is held constant.

Why does voltage decrease when temperature increases?

The decrease in the band gap of a semiconductor with increase in temperature is an increase in the energy of electrons in the material. Lower energy is thus required for breaking the bond. The open circuit voltage decreases with temperature decrease because of the temperature dependence of I0.

Why does resistance in a thermistor decrease with temperature?

NTC thermistors, resistance decreases as temperature rises due to an increase in conduction electrons bumped up by thermal agitation from valency band.

Why does resistance of thermistor decrease with temperature a level?

A thermistor is resistor which has a resistance that changes with temperature. Increasing the temperature frees more electrons to carry the current and so the resistance falls.

What happens to resistance when temperature increases?

The resistance of a conductor increases with an increase in temperature because the thermal velocity of the free electrons increases as the temperature increases. This results in an increase in the number of collisions between the free electrons.

Why does higher temperature decrease resistance?

As the temperature of the semi-conductor is increased, the electrons in the valence band gain sufficient energy to escape from the confines of their atoms. As a result, in higher temperatures, a semi-conductor’s valence electrons are free = conduction results, resistivity decreases.