Unit current is one which in a wire of unit length, bent so as to form
an arc of a circle of unit length of radius, would act upon a unit pole
at the center of the circle with unit force. Unit length is the centimeter;
unit force is the dyne.
[Transcriber's note: The SI definition of an ampere: [...]

In electro-therapeutics, a current gradually increasing in strength.

These currents, as produced from existing thermo-electric batteries,
are generated by low potential, and are of great constancy. The opposite
junctions of the plates can be kept at constant temperatures, as by
melting ice and condensing steam, so that an identical current can be
reproduced at will from a thermopile.
Thermo-electric currents were used by Ohm in establishing his law.

An intermittent current passing through a conductor will induce
secondary alternating currents in a closed circuit near it. This
secondary current will induce a tertiary current in a third closed
circuit near it, and so on. The induced currents are termed as of the
first, second, third and other orders. The experiment is carried out by
Henry’s coils.

In electro-therapeutics, the currents traversing muscular or nervous
tissue when at rest. Their existence is disputed.

In electro-therapeutics, the currents produced in living muscle or
nerves after sudden contraction or relaxation.

A term applied to groups of currents of alternating type which
constantly differ from each other by a constant proportion of periods of
alternation. They are produced on a single dynamo, the winding being so
contrived that two, three or more currents differing a constant amount
in phase are collected from corresponding contact rings. There are
virtually as many windings [...]

A current passing through a sinuous conductor.

(a) If two terminals of an active circuit are connected to two points of
a thin metallic plate the current spreads over or occupies practically a
considerable area of such plate, and this portion of the current is a
current sheet.
The general contour of the current sheet can be laid out in lines of
flux. Such lines resemble lines [...]

In electro-therapeutics, a current due to stimulation of the secretory
nerves.