What systems are heated using electrical DC power?

The correct option pertains to systems commonly heated using direct current (DC) power, particularly in aviation contexts. Windshields, windows, T2 probes, air data probes, and angle of attack (AOA) vanes are examples of components that benefit from electrical heating for several reasons.

These systems often operate under conditions where ice formation or frost could impair visibility or sensor functionality, leading to potential safety hazards. Electrical DC power is an efficient means to provide the necessary heat to these components. For instance, heated windshields can help ensure clear visibility for pilots by melting ice or preventing frost accumulation. Similarly, T2 probes, which measure air temperature for aircraft performance calculations, and AOA vanes, vital for flight safety, require consistent operational accuracy that can be compromised if ice or snow interferes with their functionality.

The components that require such targeted heating are specific to the operational effectiveness and safety of the aircraft, necessitating reliable and quick-response heating solutions, which is effectively achieved through the use of electrical DC power.