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Bijur vibrator voltage regulator.

Bijur

Bijur vibrator voltage regulator.

"Just as a head of water supplies a hydraulic pressure that causes the liquid to flow through a pipe in spite of friction, so there is an electrical pressure that forces a current through a conductor in spite of its resistance. The unit of electrical pressure is called the volt." — Avery, 1895

Voltaic cell

"Just as a head of water supplies a hydraulic pressure that causes the liquid to flow through a pipe…

"Various methods have been devised for measuring electrostatic quantity, one of the simplest of which is with the Kinnersley electrical air-thermometer. When a spark passes between the balls within the larger tube, the confined air is expanded, and the liquid column in the smaller communicating tube rises, and thus approximately indicates the quantity of the charge." — Avery, 1895

Kinnersley electrical air-thermometer

"Various methods have been devised for measuring electrostatic quantity, one of the simplest of which…

This is the instrument used for measuring the electrical potential difference between two points in an electric circuit.

Instrument for Testing Batteries

This is the instrument used for measuring the electrical potential difference between two points in…

A volt-meter in a circuit.

Volt meter

A volt-meter in a circuit.

A portable combination volt-ammeter for testing.

Volt-Ammeter

A portable combination volt-ammeter for testing.

(1745-1827) Italian inventor who gives his name to a number of electrical terms.

Count Alessandro Volta

(1745-1827) Italian inventor who gives his name to a number of electrical terms.