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Voltmeter dial

Voltmeter dial

V510/0044

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Credit

TON KINSBERGEN / SCIENCE PHOTO LIBRARY TON KINSBERGEN / SCIENCE PHOTO LIBRARY

Caption

Voltmeter dial. Dial of an old voltmeter designed to measure 0-20 volts. The voltage of an electric current is measured in volts. This unit is named for the Italian physicist Alessandro Volta (1745- 1827). Voltage is the potential difference, also called the electromotive force, measured between two points in a flow of electric current. It can be thought of as a measure of the energy intensity of the current. Early voltmeters, with an analogue dial, were based on galvanometers modified with a high resistance. The voltmeter would measure the electric current, which is related to the electric voltage by Ohm's Law. The first dial galvanometers date from the 1880s.

Release details

Model release not required. Property release not required.

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