Ammeter dial

Numéro d’image : 11904686
Ammeter dial
Ammeter dial. Dial of an old ammeter designed to measure the amount of electrical current,in amps (amperes),passing through a wire. The ampere is named after the French physicist Andre Ampere (1775-1836). This ammeter can measure between 0 and 10 amps. Early ammeters used analogue dials like this. They were based on modified galvanometers. A galvanometer measures an electrical current by the deflection produced by its magnetic effects. The deflection,proportional to the amount of current,moves the pointer and so produces the reading. The first dial galvanometers date from the 1880s
Licence : Droits gérés
Crédit: Science Photo Library / Kinsbergen, Ton
Taille de l’image : 5131 px × 3406 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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