current the regular force required to do the work.

North Pole, The term applied to the force located near
Electric. the north pole of the globe, to which a permanent
magnet will point if allowed to swing freely.

O. Abbreviation for Ohm.

Ohm. The unit of resistance. Equal to the resistance of
a column of mercury one square millimeter in cross
section, and 106.24 centimeters in length.

Ohm's Law. It is expressed as follows:
1. The current strength is equal to the electro-motive
force divided by its resistance.
2. The electro-motive force is equal to the current
strength multiplied by the resistance.
3. The resistance is equal to the electro-motive force
divided by the current strength.

Overload. In a motor an excess of mechanical work which causes
the armature to turn too slowly and produces heat.

Phase. One complete oscillation. The special form of a
wave at any instant, or at any interval of time.

Plate, Condenser. In a static machine it is usually a plate of glass
and revoluble.

Plate, Negative. The plate in a battery, such as carbon, copper or
platinum, which is not attacked by the solution.

Plating, Electro-. The method of coating one metal with another by
electrolysis.

Polarity. The peculiarity, in a body, of arranging itself
with reference to magnetic influence.

Parallel. When a number of cells are coupled so that their
similar poles are grouped together. That is to say,
as the carbon plates, for instance, are connected
with one terminal, and all the zinc plates with the
other terminal.

Polarization. When the cell is deprived of its electro-motive
force, or any part of it, polarization is the result.
It is usually caused by coating of the plates.

Porosity. Having small interstices or holes.

Positive Current. One which deflects a needle to the left.

Positive Any current flowing from the active element,
Electricity. such as zinc, in a battery. The negative