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thermal resistance, is clear from
Voltage stabilizer (regulator)

   The operating principle of a voltage stabilizer based on the use of thermal resistance, is clear from Fig. 1. Consistently with resistances R1 and R2 are included thermistor TR. R4 connected in parallel with the load resistance R2 and thermistor. By increasing the voltage increases current that flows through the thermistor, which in turn cause an increase in its temperature and reducing its resistance. This leads to a redistribution of voltage between the resistors R1 and R2 and the thermistor. With decreasing voltage current through the thermistor decreases, and consequently decrease the temperature and increase the resistance. All this will also lead to a redistribution of the voltage drop between R1, R2 and thermistor. Parameters of the last selected so that the voltage at the load terminals always remained almost unchanged. In this case, the thermistor should have a minimum thermal inertia.