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Construction of Direct Current Voltmeters and AmmetersTheoryWhenever working with electrical systems the measurement of both current and voltage can be very important Without accurate measurements of current and voltage calculations of resistance and other pertinent values could not be completed This need for measuring electric values in circuit lead to the construction of ammeters and voltmeters The ammeter measures the electric current flowing into its terminals and the voltmeter measures the potential difference applied to its terminals Ohanian 715 Current the flow of an electric charge is measured in amperes A with 1 Amp being equal to 1 Coulomb of charge moving past a point in 1 second The current is therefore related to voltage where current is flowing through a conductor or some other component of a system across which is a difference in electric potential Therefore electric potential is measured in volts V A galvanometer is a device used in the construction of both ammeters and voltmeters Serway and Faughn 623The galvanometer is defined as an instrument used to determine the presence direction and strength of an electric current in a conductor When an electric current is passing through the conductor the magnetic needle tends to turn at right angles to the conductor so that its direction is parallel to the lines of induction around the conductor and its north pole points in the direction in which these lines of induction flow In general the extent to which the needle turns is dependent upon the strength of the current In the first galvanometers a freely turning magnetic needle was hung in a coil of wire in later versions the magnet was fixed and the coil made movable Modern galvanometers are of this movable-coil type and are called dArsonval galvanometers after Ars ne dArsonval a French physicist If a pointer is attached to the moving coil so that it passes over a suitably calibrated scale the galvanometer can be used to measure quantitatively the
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