What is the primary source of power for heating the windshields?

The primary source of power for heating the windshields in aircraft typically comes from direct current (DC) power. This is used because the electrical systems in many aircraft, particularly those relying on battery power, are designed to operate using DC power. The heating elements that defrost or de-ice the windshields can effectively convert this DC power into heat, ensuring that the windshield remains clear for visibility.

In various aircraft systems, direct current is preferred for its efficiency and the ability to provide a stable power source for electrical components like windshield heaters. Considering that many aviation applications necessitate reliability and safety, DC power aligns well with these requirements, while other forms of power may not be as efficient or practical for such specific needs.