Which device provides DC power during an emergency when AC power is lost?

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Multiple Choice

Which device provides DC power during an emergency when AC power is lost?

Explanation:
The essential reason is that a stored energy source directly provides DC power when the normal AC supply fails. A battery holds chemical energy and can continuously supply direct current to the aircraft’s essential systems during an outage, making it the reliable emergency DC source. An alternator, while it can feed power, normally produces AC and would require rectification; it isn’t the immediate source of DC when AC is lost. A capacitor can discharge only for a very short time and isn’t designed to sustain power for an extended emergency. A transformer needs AC to operate and does not store energy, so it cannot provide DC power during an outage.

The essential reason is that a stored energy source directly provides DC power when the normal AC supply fails. A battery holds chemical energy and can continuously supply direct current to the aircraft’s essential systems during an outage, making it the reliable emergency DC source. An alternator, while it can feed power, normally produces AC and would require rectification; it isn’t the immediate source of DC when AC is lost. A capacitor can discharge only for a very short time and isn’t designed to sustain power for an extended emergency. A transformer needs AC to operate and does not store energy, so it cannot provide DC power during an outage.

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