Question

15.) which of these devices is a resistor that varies with temperature?
ca. thermistor
cb. gauge
cc. rheostat
cd. potentiometer

Explanation:

A thermistor is a type of resistor whose resistance changes significantly with temperature. A gauge is a device used to measure something like pressure, level, etc. A rheostat is a variable resistor used to control current by changing resistance mechanically (by moving a contact). A potentiometer is a three - terminal resistor with a sliding contact that forms an adjustable voltage divider.

Answer:

A. Thermistor