The abbreviation A.C. stands for?

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

The abbreviation A.C. stands for?

Explanation:
A.C. stands for alternating current, the type of electrical current that reverses direction periodically. This is distinct from direct current, which flows in one direction. In aircraft systems, alternating current powers many avionics and electrical components at common frequencies (such as 400 Hz), enabling lighter, compact transformers and equipment. The other options aren’t standard terms for this concept: “atmospheric current” isn’t a recognized electrical term, “anode current” refers to a specific part of vacuum-tube electronics, and “alternating circuit” isn’t the conventional label for the type of power used.

A.C. stands for alternating current, the type of electrical current that reverses direction periodically. This is distinct from direct current, which flows in one direction. In aircraft systems, alternating current powers many avionics and electrical components at common frequencies (such as 400 Hz), enabling lighter, compact transformers and equipment. The other options aren’t standard terms for this concept: “atmospheric current” isn’t a recognized electrical term, “anode current” refers to a specific part of vacuum-tube electronics, and “alternating circuit” isn’t the conventional label for the type of power used.

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