Quotation from: General Science

Written by: Bertha M. Clark


314. Ammeters. A galvanometer does not measure the current, but
merely indicates the relative strength of different currents. But it
is desirable at times to measure a current in units. Instruments for
measuring the strength of currents in units are called ammeters, and
the common form makes use of a galvanometer.


A current is sent through a movable coil (the field magnet and coil
are inclosed in the case) (Fig. 234), and the magnetic field thus
developed causes the coil to turn, and the pointer attached to it to
move over a scale graduated so that it reads current strengths. This
scale is carefully graduated by the following method.

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