What voltage is used by the emergency power supply for standby horizon and emergency lighting?

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Multiple Choice

What voltage is used by the emergency power supply for standby horizon and emergency lighting?

Explanation:
The key idea here is that the emergency power supply for the standby horizon and emergency lighting runs at a fixed, low-voltage DC level so critical instruments and lights stay on when normal power is lost. That voltage is 24 volts DC. Using 24 V keeps the emergency system compact and efficient while still delivering enough power to the standby attitude indicator and the emergency lighting. Other voltages are associated with different parts of the aircraft’s electrical system, but they aren’t the standard rating for this particular emergency supply.

The key idea here is that the emergency power supply for the standby horizon and emergency lighting runs at a fixed, low-voltage DC level so critical instruments and lights stay on when normal power is lost. That voltage is 24 volts DC. Using 24 V keeps the emergency system compact and efficient while still delivering enough power to the standby attitude indicator and the emergency lighting. Other voltages are associated with different parts of the aircraft’s electrical system, but they aren’t the standard rating for this particular emergency supply.

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