Volt. The practical unit of electro-motive force; the volume and pressure of an electric current.

Voltage. Electric-motive force expressed in volts—as, a voltage of 100 volts.

Voltaic. A term derived from the name of the Italian scientist Volta, and used in many ways as applied to electrical current and devices. Formerly the term galvanic was commonly employed.

Voltaic Electricity. (See [Electricity, Voltaic].)

Voltimeter. An instrument for measuring the voltage of a current.

Vulcanite. Vulcanized rubber. Valuable for its insulating properties and inductive capability.

W

Watt. The practical unit of electrical activity; the rate of work or rate of energy. It is a unit of energy or of work represented by a current of one ampere urged on by one volt of electro-motive force.

The volt-ampere.

The standard of electrical energy corresponding to horse-power in mechanics.