Advanced theory of electricity and magnetism; A text-book for colleges and technical schools (1915)
Franklin, William S. (William Suddards), 1863-1930, MacNutt, Barry, 1878-1936. joint author · New York, Macmillan · leaf 43
h the spring 5 can be twisted andthe angle of twist <f> can be read off thedivided circle. When the spring S is un-twisted and when no current is flowingthrough A and B, the pointer p standsin a certain zero position. When thecurrent I, to be measured, flows throughA and B a torque or turning… … I = kV<t> (i) in which k is a constant which is called the reduction factor ofthe instrument. The correctness of equation (i) may be made evident as fol-lows: The stationary coil A produces a magnetic field whichpushes sidewise on the vertical legs of coil B. If the current Iis doubled this…
Electricity · Magnetism
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