Strength of Current.--Unit of Current Strength; The
Ampere.--Measurement of Current Strength.--The Tangent
Galvanometer.--The Ammeter.--The Voltameter.--Unit of Quantity;
The Coulomb.--Electrical Horse-power; The Watt.--Ohm's
Law.--Internal Resistance and Current Strength.--Exp. 142,
Having a cell with large plates, to find how the strength of the
current is affected by changes in the position of the plates, the
external resistance being small.--Exp. 143, Same as Exp. 142,
but with small plates.--Exp. 144, To find whether the changes
in current strength, due to changes in internal resistance,
are as great when the external resistance is large, as they
are when the external resistance is small.--Discussion, with
examples.--Arrangement of Cells and Current Strength.--Cells in
Series.--Cells Abreast.--Exp. 145, To find the best way to join
two similar cells when the external resistance is small.--Exp.
146, To find the best way to join two similar cells when the
external resistance is large.--Best Arrangement of Cells.