. Practical wireless telegraphy; a complete text book for students of radio communication . affects the totalinternal resistance as follows: When a number of cells in a battery are connected in series,the total internal resistance is equal to the sum of the internal resistances of all the a number of lik. cells are connected llllllllll in parallel, the total internal resistance isequal to the resistance of one cell dividedby the number of cells in the battery. A parallel connection is made byconnecting the positive terminal of onecell with the positive terminal of an-other cell and
. Practical wireless telegraphy; a complete text book for students of radio communication . affects the totalinternal resistance as follows: When a number of cells in a battery are connected in series,the total internal resistance is equal to the sum of the internal resistances of all the a number of lik. cells are connected llllllllll in parallel, the total internal resistance isequal to the resistance of one cell dividedby the number of cells in the battery. A parallel connection is made byconnecting the positive terminal of onecell with the positive terminal of an-other cell and the negative terminalof the first cell with the negativeterminal of the second cell as in thediagram Fig. 7. The left hand figureshows the direction of the flow of cur-rent of two cells connected in paralleland by this connection, the totalelectromotive force of the cells is nomore than that of a single cell but thecurrent available (in amperes) is thatof one cell, multiplied by the numberof cells in the group. Applying this to the right hand dia-gram of Fig. 7 where four cells are con-. + c z i !-t-: 1 1 &- 1 :r-r-~:55f.^ R JWWWW- isv + !■- + V + R -vvwww- 9 OHM& Fig. 7—Electric Cells Joined in Parallel. THE PRODUCTION OF ELECTROMOTIVE FORCE. 11 nected in parallel, the potential difference across the terminals is volts and the currentavailable in amperes will be 4 X IS or 60 amperes. If the resistance of R is rather high,of the order of a few hundred ohms, this potential difference can be measured by connect-ing a voltmeter across the terminals. It should indicate E. M. F. of V/z volts. We seefrom this that the final effect of a parallel connection in the case cited is the same as if 4 zinc plates joined together and 4 carbon UNIT A V +
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
