Definition
The process of converting alternating current (AC) into direct current (DC) by allowing current to flow in only one direction. In aircraft electrical systems, rectification is performed by diodes or rectifier assemblies, most commonly to convert the AC output of an alternator into the DC required by the aircraft's electrical bus and battery.
Plain English
Turning back-and-forth electrical current into one-way current so it can be used by aircraft systems and the battery.
Context Anchor
Seen in aircraft electrical-system discussions, especially where alternator output is changed into usable direct current for the aircraft and battery.
Derivation
From Latin 'rectus' meaning 'straight' or 'right.' To rectify literally means 'to make straight.' In electrical terms, it describes straightening out current that alternates direction so it flows only one way.
Why Pilots Care
Aircraft batteries and most onboard electronics need DC to operate, but alternators produce AC. Without rectification, the alternator's output would be unusable, and the battery could not be charged in flight.
Analogy
Rectification is like a one-way gate for electricity: instead of letting flow go back and forth, it allows useful output in one direction.
Intuition Check
Rectification does not mean simply correcting a mistake here. In this maintenance context, it means changing reversing electrical flow into one-way electrical flow.
Example Sentence 1
The alternator produces AC, which passes through a bank of diodes for rectification before reaching the aircraft's DC bus.
Example Sentence 2
Without effective rectification the battery would not receive the steady current needed for reliable engine starts.