This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...for maximum steady current, 05 sec From these data we may now draw the three curves, as in Fig.. 92, wherein the abscissae are the values of time in seconds, and the ordinates the current The faint vertical dotted lines mark the timeconstants in the three cases. It will be seen that when rapid working is required the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...for maximum steady current, 05 sec From these data we may now draw the three curves, as in Fig.. 92, wherein the abscissae are the values of time in seconds, and the ordinates the current The faint vertical dotted lines mark the timeconstants in the three cases. It will be seen that when rapid working is required the magnetizing current will rise, during short intervals of time, more rapidly if all the cells are put in series than it will do if the cells are grouped according to the amateur rule. When they are all put in series so that the battery has a much greater resistance than the rest of the circuit, the current rises much more rapidly, because of he smallness of the time-constant, although it never attains the same ultimate maximum as when grouped in the other way. That is to say, if there is self-induction as well as resistance in the circuit, the amateur rule does not tell you the best way of arranging the battery. There is another mode of regarding the matter which is helpful. Self-induction, while the current is growing, acts as if there were a sort of spurious addition to the resistance of the circuit; and while the current is dying away it acts of course in the other way, as if there were a subtraction from the resistance. Therefore you ought to arrange the battery so that the internal resistance is equal to the real Curves Of Rise Of Current With Different Groupings Of Battery. resistance of the circuit, plus the spurious resistance during that time. But how much is the spurious resistance during that time? It is a resistance proportional to the time that has elapsed since the current was turned on. So then it comes to a question of the length of time for which you want to work it What fraction of a second do you require your signal to be give...
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