What do thermistors in an electrically heated windshield system do?

Thermistors in an electrically heated windshield system play a crucial role in maintaining a consistent and safe temperature of the windshield. They are temperature-sensitive resistors that provide real-time feedback regarding the temperature of the windshield. When the windshield begins to cool down below a preset threshold, the thermistors detect this drop in temperature and signal the heating elements to activate and warm the glass back up to the desired level. This helps to prevent ice build-up and fogging, ensuring optimal visibility for the pilot and enhancing safety during flight.

By continuously monitoring the temperature and adjusting the heating elements accordingly, thermistors make sure that the windshield remains at a normal operating temperature, which is vital for both performance and safety in varying ambient conditions. This key function distinguishes their role from the other options provided.