Which cockpit light is powered by the battery bus and will cause the battery to be drained, even when the battery master switch is OFF?

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Multiple Choice

Which cockpit light is powered by the battery bus and will cause the battery to be drained, even when the battery master switch is OFF?

Explanation:
The key idea is how the battery and master switch interact with different electrical feeds. The battery master switch is meant to disconnect the battery from the main electrical system to prevent drain when the aircraft is not in use. But some loads are wired directly to the battery bus, so they stay powered even if the master is OFF. The dome light is one of those loads. If the dome light is on, it draws current straight from the battery bus, so the battery can be drained even with the master switch OFF. In contrast, other cockpit lights are typically routed through buses that are de-energized when the master is OFF, so they don’t continue to draw power in that state.

The key idea is how the battery and master switch interact with different electrical feeds. The battery master switch is meant to disconnect the battery from the main electrical system to prevent drain when the aircraft is not in use. But some loads are wired directly to the battery bus, so they stay powered even if the master is OFF. The dome light is one of those loads. If the dome light is on, it draws current straight from the battery bus, so the battery can be drained even with the master switch OFF. In contrast, other cockpit lights are typically routed through buses that are de-energized when the master is OFF, so they don’t continue to draw power in that state.

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