An advantage of the use of AC in a large aircraft electrical system is high voltage transmission. This permits:

• A. Low current levels
• B. Higher current levels
• C. More generators needed
• D. Increased weight

Answer: (A)

Transmitting power efficiently hinges on the relationship P = V × I. For the same power demand, increasing the voltage reduces the current. In a large aircraft, lower current means you can use thinner, lighter wiring and experience smaller resistive losses (I^2R losses) in the conductors. That’s why high voltage AC transmission is advantageous: it lets the system carry the required power with low current, reducing weight and heat in the wiring and components.

So the statement that fits best is that low current levels are permitted. Higher current would demand heavier, bulkier wiring and more heat; adding more generators isn’t a necessary benefit, and increased weight would work against the aim of efficient distribution.