Thermistor - Zero-Power Resistance

[2X]

Hi,
I am trying to understand what is the characteristic "Zero-Power Resistance" of a thermistor. I found the below explanation on the internet. If we take the thermistor in the picture (in red) will have 4ohm resistance at 25Celcious when the dissipated power on is 2.3Watt (for instance P=I^2*R = 0.76^2 A * 4 ohm ~= 2.3Watt)?

General Information - Vishay Dale - NTC Thermistors
This is the DC resistance value of a thermistor measured at
a specified temperature with a power dissipation by the
thermistor low enough that any further decrease in power will
result in not more than 1.0 percent (or 1/10 of the specified
measurement tolerance, whichever is smaller) change in
resistance.

[Vovk_Z]

If in short: zero power resistance is a resistance you may measure with DMM (Ohmmeter) if thermistor have a room temperature.

[2X]

If in short: zero power resistance is a resistance you may measure with DMM (Ohmmeter) if thermistor have a room temperature.

Can a thermistor have 4ohm resistor in room temperature? If starts flows current throw it then the resistor (NTC) will drop in mohm scale?

[anvoice]

I can't find any "4 Ohm at room temperature" from Vishay Dale on Digi-Key. In general, 4 Ohms seems a bit on the low side, typically the values are higher. E.g. 100 kOhms at room temperature is typical for 3D-printer thermistors.

When measuring the resistance with a DMM, you indeed get a current flowing through the thermistor. However, it's typically below 1 mA, which means the thermistor will barely heat up (also depends on thermal mass of thermistor), so the change will likely be negligible compared to actual temperature perturbation.

[schmitt trigger]

There are two wide areas where NTC thermistors are used.

The first one is temperature sensing, and its zero power resistance at ambient temp is in the several kilo-ohm range.

The second is inrush current limiting, at power line voltages. These are available in tens of ohms or even single-digit ohms at zero power.
An example from digikey:

 

[Vovk_Z]

Can a thermistor have 4ohm resistor in room temperature? If starts flows current throw it then the resistor (NTC) will drop in mohm scale?

Yes, it can. Resistance is backwards proportional to its temperature. Temperature is proportional to dissipated power (near linear law).
Active power is P = I^2 × R.