Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 225
rningforce on the coil C while the current alternates is proportional tothe average value of i2 or to the effective current. Such an instrument may be used to measure both direct andalternating currents and the reading would be the same for 10amp. direct current as for 10 amp. effective alternating… … Tig. 219. Fig. 220. such as a are cut by lines of force and the e.m.f. in these con-ductors varies as shown in Fig. 220 and goes through one cyclefor every pair of poles that pass.
Electrical engineering
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