Ques. What is the indication that the rectifier needs recharging?
Ans. Excessive heating of the solution with normal load.
Ques. What is the indication that a rectifier is passing alternating current?
Ans. It will heat, and if the solution be very weak, it will cause a buzzing sound.
Fig. 2,088.—The Churcher valve. This is of the modified Nodon type. It differs from the latter in that it has two cathodes of aluminum and an anode of lead or platinum, suspended in the one cell. This permits the complete utilization of both halves of the supply wave with one cell instead of the four required in the Gratz method. The connections of such a cell are shown in the figure. The secondary of the transformer carries a central tapping, and is connected through the direct current load to the central anode, while each of the cathodes is connected to the ordinary terminals of the transformer itself. The practical limits of the cell are 50 volts direct current, or 130 volts at the transformer terminals AB. F, is the anode; C, cathode I; D, cathode II.
Ques. What harm is caused by operating a rectifier with a weak electrolyte?
Ans. The electrodes will eat away.