Definition
The standard unit of electric current. One ampere equals one coulomb of electric charge flowing past a point in one second. In aircraft electrical systems, current is measured in amperes (often shortened to amps) and indicated on ammeters or load meters.
Plain English
An ampere is a measurement of how much electricity is flowing through a wire. The higher the ampere reading, the more electricity is moving through the circuit at that moment.
Context Anchor
Seen in aircraft electrical system discussions, ammeter readings, battery charging checks, and circuit protection limits.
Derivation
Named after André-Marie Ampère, a French physicist who studied the relationship between electricity and magnetism in the early 1800s. His work became the foundation for measuring electric current, so the unit was named in his honor.
Why Pilots Care
Aircraft electrical systems depend on correct current levels; too little or too much can cause equipment failure, drained batteries, or overheating.
Analogy
Think of electric current like water in a pipe. Amperes measure how much water is flowing past a point each second — not the pressure, just the rate of flow.
Grounding Statement
If an aircraft ammeter shows 10 amperes, it is showing the amount of current flowing in that part of the electrical system at that moment.
Intuition Check
Do not confuse amperes with electrical pressure. Amperes measure current flow; they do not, by themselves, tell you the voltage or total electrical power.
Example Sentence 1
The ammeter showed a steady draw of 25 amperes after the landing lights were turned on.
Example Sentence 2
Technicians measure amperes drawn by the starter motor to confirm it is within limits.