Definition
The unit of electrical pressure (electromotive force) that pushes electrons through a conductor. One volt is the amount of electrical pressure needed to push one ampere of current through a resistance of one ohm.
Plain English
A volt measures how hard electricity is being pushed through a wire. The higher the voltage, the stronger the push.
Context Anchor
Seen in aircraft electrical system checks, battery ratings, generator or alternator output, wiring diagrams, and component specifications.
Derivation
Named after Italian physicist Alessandro Volta, who built the first electric battery around 1800. Knowing the unit is named after a person (not derived from a property) helps explain why it carries no descriptive meaning of its own — it is simply the agreed-upon name for electrical pressure.
Why Pilots Care
Aircraft systems are designed for specific voltages (commonly 14V or 28V DC). Voltage that is too low means equipment won't operate reliably; voltage that is too high can damage avionics and electrical components.
Analogy
Voltage is like water pressure in a hose. Higher pressure pushes more water through; higher voltage pushes more electrical current through a circuit.
Intuition Check
A volt does not measure the amount of electricity flowing — that's amperes. It measures the pressure pushing the electricity along.
Example Sentence 1
The aircraft battery is rated at 24 volts when fully charged.
Example Sentence 2
A voltmeter reading of 28 volts confirms the alternator is charging the system correctly.