FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

A thermistor, which is a type of temperature sensor that changes resistance in response to temperature changes, is used as a temperature sensing element in an electrically heated windshield. A resistor (A) is a passive component that has a fixed resistance, which would not be suitable for sensing temperature changes. A capacitor (B) is used for storing electrical charge and does not change resistance with temperature changes. A transformer (D) is used for stepping up or stepping down alternating current (AC) voltage and is not suitable for temperature sensing.