Which item is not a source of electrical power?

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Multiple Choice

Which item is not a source of electrical power?

Explanation:
In an electrical system, a source is something that provides power to the system, not something that consumes it. Navs refers to navigation equipment, which uses power to operate but does not generate or provide power itself. It’s a load. The other items do provide power. The APU battery stores energy and can supply DC power to the aircraft, especially for start and early operations. The IDG 2 is an engine-driven generator that feeds electrical power into the systems when the engines are running. The GPU is a Ground Power Unit that supplies external electrical power while the aircraft is on the ground. So Navs is not a source of electrical power because it consumes power rather than generates it.

In an electrical system, a source is something that provides power to the system, not something that consumes it. Navs refers to navigation equipment, which uses power to operate but does not generate or provide power itself. It’s a load.

The other items do provide power. The APU battery stores energy and can supply DC power to the aircraft, especially for start and early operations. The IDG 2 is an engine-driven generator that feeds electrical power into the systems when the engines are running. The GPU is a Ground Power Unit that supplies external electrical power while the aircraft is on the ground.

So Navs is not a source of electrical power because it consumes power rather than generates it.

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