Resistance, Meter-millimeter Unit of.
The resistance of a wire of copper one meter long and one square
millimeter in section. It is equal to .02057 ohms at 0º C. (32º F.) The
term may also be applied to the resistance of similar sized wire of
other metals.
Resistance, Mil-foot Unit of.
The resistance of a foot of copper wire one-thousandth of an inch in
diameter. It is equal to 9.831 ohms at 0º C. (32º F.) The term may also
be applied to the resistance of similar sized wire of other metals.
Resistance, Non-essential.
The resistance of the portion of an electric circuit not within the
generator; the same as external resistance.
Synonym--External Resistance.
Resistance, Non-inductive.
A resistance with comparatively little or negligible self-induction.
Resistance of Human Body.
The resistance of the human body is largely a matter of perfection of
the contacts between its surface and the electrodes. It has been
asserted that it is affected by disease. From 350 to 8,000 ohms have
been determined as resistances, but so much depends on the contacts that
little value attaches to the results.
Resistance, Ohmic.
True resistance measured in ohms as distinguished from
counter-electro-motive force, q. v. The latter is called often spurious
resistance.
Synonym--True Resistance.
[Transcriber's note: "True" vs. "spurious" are interesting terms,
considering that today we define impedance as a combination of "real"
resistance and "imaginary" capacitive and inductive reactance.]
Resistance, Reduced.
The resistance of a conductor reduced to ohms, or to equivalent lengths
of a column of mercury, 1 square millimeter in cross area.
Resistance, Siemen's Unit of.
The resistance of a column of mercury 1 meter long and 1 square
millimeter cross-sectional area at 0º C. (32º F.)
It is equal to .9431 legal ohm.
Resistance, Specific.
The relative resistance of a substance. It is expressed as the actual
resistance of a cube of the substance which is one centimeter on each
edge. For metals it is usually expressed in microhms, for liquids in
ohms.
The resistances of a specified length of wire of specified diameter of
different substances is often given, and is really a particular way of
stating specific resistances.
Synonym--Specific Conduction Resistance.
Resistance, Spurious.
The counter-electro-motive force, q. v., operating to prevent a current
being produced of what should be its full strength were the true
resistance and actuating electro-motive force only concerned. Such
counter-electro-motive force may be treated as a spurious resistance and
such a value in ohms assigned to it as would correspond to its proper
effect.