A laboratory manual of electrotherapeutics . or resistances orbetween the battery and a resistance, and notice that theneedle indicates the same current in each case. Experiment 32.—Having one cell of the experi-mental battery send the current through the galvanometerand take the reading. Now introduce in succession thefollowing resistances 25, 60, 100, 150, 200 and 600 the last case use the B terminals also. In each casetake the deflection and by reference to the calibrationtable find the strength of current. Also calculate the cur-rent in each case by Ohms law, and compare results. T
A laboratory manual of electrotherapeutics . or resistances orbetween the battery and a resistance, and notice that theneedle indicates the same current in each case. Experiment 32.—Having one cell of the experi-mental battery send the current through the galvanometerand take the reading. Now introduce in succession thefollowing resistances 25, 60, 100, 150, 200 and 600 the last case use the B terminals also. In each casetake the deflection and by reference to the calibrationtable find the strength of current. Also calculate the cur-rent in each case by Ohms law, and compare results. Ther of a cell may be called 4 are tlic sources of error ? Experiment 33.—Use the A ter-minals of the galvanometer to meas-ure the current given by 1, 2, 3, 4cells suc-cessively, coupling the cellsin series. Why do 4 cells give no Pig. 1. Graphite Kliostat. greater current than one ? Calculate the strength of current in each case. The resistance ofthe galvanometer coil connected with the A terminals isabout one-tenth of an 32 LABORATORY MANUAL Experiment 34.—Repeat Exp. ^^, using a resistanceof from 100 to 200 ohms. Why does the current increaseas the cells are added? Calculate the current by Ohmslaw as before. Experiment 35.—Again repeat Exp. 33, but this timecoupling the cells in multiple arc instead of in series. Whydo you get a greater current from four cells than from onein this case ? Again express the strength of current byOhms law. Experiment 36.—With the A terminal of the galvan-ometer and a resistance of 200 ohms, measure in succes-sion the current from 1, 2, 3 and 4 cells in multiple do the four give no greater current than one? To measure the internal resistance of a cell jointwo cells of the experimental battery in opposition and thensend the current from a large bichromate cell throughthem, having the galvanometer in circuit. Note carefullythe deflection of the galvanometer. Now remove the twocells joined in opposition and introduc
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