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Primary Systems 2 Practice Test

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The primary source of electrical power on the aircraft is the?
Correct Answer:
Generator
Explanation:
The engine-driven generator is the primary source of electrical power because it provides continuous, normal-power to all aircraft systems while the engines are running and also keeps the batteries charged. Batteries serve as energy storage for starting and as backups during electrical faults, but they cannot supply sustained power for the whole system. The auxiliary battery offers an additional backup to critical loads in certain configurations, ensuring essential equipment can operate if the main power source drops. So, in routine flight, the generator supplies the bulk of electrical power, with the batteries stepping in only for starting or emergency use.

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