Which item is a source of electrical power?

Which item is a source of electrical power?

• A. APU Battery
• B. Navs
• C. Dome
• D. DC Emergency Bus

Answer: (A)

The key idea is telling apart something that generates or stores electrical power from things that use or distribute it. The APU battery stores chemical energy and can deliver electrical power to run systems or to start the auxiliary power unit. That makes it a true source of electrical power. Navs are equipment that require power; they don’t generate it. The dome is a load that consumes power, like a light. The DC Emergency Bus is a power-distribution path that carries power to essential systems, not a generator or storage source itself. So the APU battery is the item that supplies electrical power.

The key idea is telling apart something that generates or stores electrical power from things that use or distribute it. The APU battery stores chemical energy and can deliver electrical power to run systems or to start the auxiliary power unit. That makes it a true source of electrical power.

Navs are equipment that require power; they don’t generate it. The dome is a load that consumes power, like a light. The DC Emergency Bus is a power-distribution path that carries power to essential systems, not a generator or storage source itself.

So the APU battery is the item that supplies electrical power.