. Rectification of alternating currents by means of a carbon arc. oscillograms show that the waves of both voltageand current are very narrow in comparison with the spacebetween them. This is accounted for as follows. When thealternating or rectified current commences to flow it mustfirst overcome the voltage of the rectifying D C arc. Thusthe value of the rectified voltage is (1) ex = —^— e2 - K( Prom Steinmetz Transient Electric Phenomenaand oscillations,page 252.)Here is. the rectified voltage, e2 the effective valueof the A C voltage before rectification, and K is a constant,being the volt
. Rectification of alternating currents by means of a carbon arc. oscillograms show that the waves of both voltageand current are very narrow in comparison with the spacebetween them. This is accounted for as follows. When thealternating or rectified current commences to flow it mustfirst overcome the voltage of the rectifying D C arc. Thusthe value of the rectified voltage is (1) ex = —^— e2 - K( Prom Steinmetz Transient Electric Phenomenaand oscillations,page 252.)Here is. the rectified voltage, e2 the effective valueof the A C voltage before rectification, and K is a constant,being the voltage of the D C arc between the A C terminals( See A C Pig. 5. ) Thus we must substract a constant fromthe instantaneous values of the rectified wave. The wavebefore rectification appears as a full line in Pig. 17. Aconstant is now subtracted from each loop and if the alter-nating wave continues, the wave as shown by the dotted linein Pig. 17 will result, one half, however, is suppressed inrectifying and the result is a wave as shown in Pig. IS. This Page 21. Fig. 15- Voltage wave obtained with the cooled terminals showingcomplete rectification.
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