Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 145
istance combined with thesteadying resistance or ballast becomes a large unit whichhas to introduce a potential drop of 170 volts, because of 138 MOTION PICTURE ELECTRICITY the fact that the arc requires only 50 volts. Fig. 80 showsthe voltage drop in the different sections of the circuit.^or 550… … Fig. 79 sistance becomes very large, and as the arc requires thesame drop, namely, 50 volts, it is evident that about 500volts has to be consumed in the reducing and steadying d. c. 220 V. CONSTANT POTENTIAL
Motion picture theaters · Electric lighting
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