. The Ontario high school physics. ltaic Cell ElectricallyCharged. Since an electric current flowsthrough a conductor joining the plates of avoltaic cell, we would infer that the platesare electrically charged when can be shown to be the case by meansof a condensing electroscope, which consistsof an ordinary gold-leaf electroscope combinei)with a suitable condenser. A convenient arrangement is illustrated inFig. 486. It is unsatisfactory to work witha single voltaic cell. Three or four should be joined inseries as shown at B. These cells may be small glass tubes s ; ; z S>
. The Ontario high school physics. ltaic Cell ElectricallyCharged. Since an electric current flowsthrough a conductor joining the plates of avoltaic cell, we would infer that the platesare electrically charged when can be shown to be the case by meansof a condensing electroscope, which consistsof an ordinary gold-leaf electroscope combinei)with a suitable condenser. A convenient arrangement is illustrated inFig. 486. It is unsatisfactory to work witha single voltaic cell. Three or four should be joined inseries as shown at B. These cells may be small glass tubes s ; ; z S>zziz:<iC m . . i IphurieAi M Fig. 485.—Simplevoltaic cell. PLATES OF A VOLTAIC CELL 399 or bottles containincr dilute sulphuric acid, with strips ofcopper and zinc soldered together and dipping in condenser consists of two perfectly flat brass lower one Af is supported on an ebonite stem, andthe upper one JSf is furnished with a handle. A sheet ofparaffined paper or dry writing paper or very thin mica is. e r c z c z Fio. 486.—The condensing electroscope. placed between the plates. The binding-posts e and / arejoined to the electroscope, which is the same as shown inFig. 463, with the disc removed. Its binding-post is joined toa gas-pipe or other good earth-connection. The end zinc plateZ of the battery is joined to a and the end copper plate Gis joined loosely by the wire lo to the binding post h. When the connections have been made as described, there isa charge on the gold leaves, but it is so slight that they donot diverge appreciably. Now by means of a glass or ebonite Iod remove the wire wfrom the binding post h, and then lift off the iipper plate N ofthe condenser. The leaves now diverge. This action may be explained thus:—When the connectionsare as shown in the figure, Z and N are both joined to earthand hence are at zero potential. The lower plate M is chargedpositively by the battery. This charge attracts a houndnegative charge to the lowe
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
