Electricity for public schools and colleges . s latter there may be. First, a current is passed through each cell separately until a considerableamount of gas has been set free in each ; this amount must be the same in all. Then these cells are in reality battery-cells. They can be coupled up forsmall internal resistance, all the kathodes together and all the anodes together;or for , anode to kathode and so on. The hydrogen in the one tube and the oxygen in the other tube of eachtend to reunite ; and it is found that when the external circuit is completedthis reunion will take place step
Electricity for public schools and colleges . s latter there may be. First, a current is passed through each cell separately until a considerableamount of gas has been set free in each ; this amount must be the same in all. Then these cells are in reality battery-cells. They can be coupled up forsmall internal resistance, all the kathodes together and all the anodes together;or for , anode to kathode and so on. The hydrogen in the one tube and the oxygen in the other tube of eachtend to reunite ; and it is found that when the external circuit is completedthis reunion will take place step by step with the passage of a current, the o 2 196 ELECTRICITY CH. XII. action being merely the molecular interchange, explained in § 4, reversed indirection. The current will be in the reverse direction to that by which theelectrolysis was in the first instance effected. Here each cell answers to a Voltas cell in which the zincplate has been replaced by hydrogen in contact with platinum;the copper plate by oxygen in contact with Notes.—(i.) The recombination can occur only when the circuit is closed ;and, further, only when there is a platiimni plate that is in contact both withthe gas and the liquid. This action of the platinum will be familiar to thosewho have studied elementary chemistry. (ii.) There will be a current if we replace the platinum-oxygen plate byplain platinum. This is due to the fact that there is always some oxygen dis-solved in the dilute acid. § 13. Secondary, or Storage, Cells.—Any arrangement bymeans of which chemical-potential-energy may be used up insuch a manner as to give us the equivalent energy of an electriccurrent is called a ^battery-cell, or often more shortly a the cell is put together out of certain materials and thendoes 7iot require the passage of an electric current before it is fitfor use, it is called a ^primary-cell All the cells described inChapter XI. § 11, were of this class. But where the cell requires
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