Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1916-11-18


which produces q lower current.
The ampere hour capacity OF bat
terry on intermittent service, such as
in ignition. is entirely different from
It's aInpere hour capacity when pro-
ducing a current continuously The
terminal voltage will decrease more
rapidly az first when the cell is pro
ducing a current continuously than
when il Is producing current inter
mittently, but after the cell has been
IN service for some time the terminal
voltage OF the cell producing the cur
rent internationally viii decrease fast
or than The terminal voltage of the
cell producing the current continuous.
~
II a number OF cells be connected
in series tie negative plate of one
cell Joined TO the positive plate OF the
next cell and so Oman electrical
pressure will be produced between the
positive plate at one end and the mega
tive plate al the other end equal in
value. TO the sum Of the pressure pro-
dGced by the different cells connected
IN series in Figure 6.
II number of cells he connected in
parallel--the negative plates of all the
different cells connected together to
form one terminal and the positive
plates of all different cells connected
together 10 form a second terminal
an electrical pressure viii be produced
between the positive terminal and the
negative terminal equal in value TO the
pressure produced by a single cell. pro
vided the different cells are each pro-
ducing the same pressure. Three cells
are shown connected IN parallel in
Figure T.
Any series. parallel or combination
of series and parallel connections of
cells constitute battery.
1t is customary in practise to repre-
sent cell by means of two parallel
lines, instead OF drawing picture Of
the cell each time you want to show 1t
in a diagram IN Figure battery
OF three cells is represented. The long
line corresponds to the plus Cd, or
positive terminal, and the short line
corresponds to the minust-), or mega
tive terminal
Combination Of Cells for Best Results
Suppose that a piece Of apparatus
having resistance of rs ohms is TO be
operated from dry cells and that the
voltage must not be less than volts
at any time. Two cells connected In
series will produce the desired results
until their terminal voltage drops to
volt a cell. If, however, four cells
be used and they be connected two in
series and the two series groups in
parallel, much longer life will be OBJ
tanned from the cells than when only
two cells are used.
In the first case the two cells are
each carrying the total current, while
in the second case each cell is carry
ing only one-haf of the total current,
rs there are two groups of cells in par
allel. In the second case each group
of cells might be thought of as dis
charging through resistance of 80
ohms rather than Is ohms, and the life
will be more than twice as great as
the life of the two cells when used
alone or discharging through resist.
ance of 16 ohms.
When a number of cells are con-
nected in parallel they should all pro
duce the same electrical pressure and
have the same internal resistance. II
/
the electrical pressure in one path OF
the parallel circuit is greater than the
electrical pressure in the other path.
or paths, then there will be current
through the path of higher pressure
into the path. or paths, of higher pres
sure The direction Of this current in
the path of higher pressure will cor
respond to the direction of the pres
sure in that path, while the current in
the path, or paths. of lower pressure
will be in the opposite direction to the
pressure in the respective paths. This
condition of affairs results in the cells
in one path discharging into the cells
in some other path, or paths, and
there is chemical action taking place
which is detrimental TO the life Of the
cells, even though there be no current
supplied to the device or apparatus