Definition
A full-wave rectifier circuit that uses four diodes arranged in a bridge configuration to convert alternating current (AC) into direct current (DC). During each half of the AC cycle, two of the four diodes conduct while the other two block, so current always flows through the load in the same direction.
Plain English
An electrical circuit built from four one-way valves that takes power which flips back and forth and turns it into power that flows steadily in one direction.
Context Anchor
Seen in aircraft electrical-system discussions, especially around alternators, power supplies, battery charging, and equipment that needs direct current.
Derivation
Called a bridge because the four diodes are wired in a diamond shape that resembles the structural layout of a bridge, with the AC input connected across two corners and the DC output taken from the other two. Rectifier comes from the Latin rectus meaning straight, because the circuit straightens out the back-and-forth flow of AC into a one-way flow.
Why Pilots Care
Aircraft alternators generate AC that must be converted to DC to charge the battery and power the aircraft electrical bus without damage or system failure.
Analogy
Think of four one-way gates arranged so people can enter from either side, but everyone is guided to leave through the same exit. The input direction changes, but the output direction stays the same.
Intuition Check
“Bridge” does not mean a physical bridge in the aircraft. Here it means the shape of the electrical circuit used to route current in one direction.
Example Sentence 1
The alternator's output passes through a bridge-type rectifier before reaching the aircraft's DC bus.
Example Sentence 2
A failed bridge-type rectifier can cause the electrical system to lose charging capability and trigger an alternator warning light.