Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 120
nt of deflection of the needle from the zero position dependsupon the strength of the current or the voltage according as thecoil is wound to indicate amperes or volts. AMMETERS. VOLTMETERS, AND WATTMETERS 539 Ques. Describe a moving coil instrument. Ans. This type of instrument is shown in fig.… … Fig. 621.— Moving coil type instrument. The essential parts are: A, spiral spring; C coil;K, soft iron core; M, permanent magnet; P, pointer; S, scale. Current passing throughthe coil causes the moving system to turn against the restraining force due to the influ-ence of the permanent magnet. held…
Electrical engineering
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