Definition
The production of electrical energy by a chemical reaction between two dissimilar metals (electrodes) immersed in an electrolyte. The chemical action causes electrons to flow from one metal to the other through an external circuit, producing a usable voltage. This is the operating principle of all chemical batteries, including the lead-acid and nickel-cadmium batteries used in aircraft.
Plain English
Making electricity through a chemical reaction. Two different metals sit in a liquid or paste that lets them react with each other, and that reaction pushes electrons through a wire connecting them. That flow of electrons is electricity. This is how every battery works.
Context Anchor
Seen in basic aircraft electrical system study, especially when learning how batteries produce power and why some metal combinations can cause corrosion.
Derivation
Named after Luigi Galvani, an 18th-century Italian scientist who discovered that a chemical reaction between dissimilar metals could produce an electric current. Knowing the name comes from the man who first observed the effect helps anchor the concept: galvanic always means electricity produced chemically.
Why Pilots Care
Aircraft batteries depend on this process to supply starting power and run essential systems when the engine is not turning.
Analogy
A simple classroom lemon battery shows the idea: two different metals placed in the lemon can produce a small voltage because the lemon juice acts as the conducting liquid.
Intuition Check
Do not confuse galvanic generation with an engine-driven generator or alternator. Galvanic generation makes electricity by chemical action, not by spinning a machine.
Example Sentence 1
The aircraft battery uses galvanic generation of electricity to supply power to the starter and avionics before the engine is running.
Example Sentence 2
Maintenance checks confirm that the cells continue to support galvanic generation of electricity after long periods of storage.