Electrical instruments

thumb|320px|An early D'Arsonval galvanometer showing magnet and rotating coil

thumb|Gilbert's versorium The electroscope is an early scientific instrument used to detect the presence of electric charge on a body. It detects this by the movement of a test charge due to the Coulomb electrostatic force on it. The amount of charge on an object is proportional to its voltage. The accumulation of enough charge to detect with an electroscope requires hundreds or thousands of volts, so electroscopes are used with high voltage sources such as static electricity and electrostatic machines. An electroscope can only give a rough indication of the quantity of charge; an instrument t

device used to measure electricity use

antique electrical device which stores a high-voltage electric charge

electrostatic generator

thumb|Electrophorus from the 1800s.

thumb|right|Illustration of Versorium construction