Equivalent, Electro-mechanical.
The work or energy equivalent to unit quantities of electric energy, q.
v.; or equivalent to a unit current in a conductor whose ends differ one
unit of potential. The unit of electric energy taken is the watt-second
or volt-coulomb. One volt-coulomb is equal to
Ergs 1E7 [10000000]
Foot Pound .737337
Gram-degree C. .24068
Horse Power Second .0013406
Pound-degree F. .000955
One horse power is equal to 745.943 volt coulombs per second.
Equivalent, Electro-thermal.
The heat produced by a unit current passing through a conductor with
unit difference of potential at its ends; the heat equivalent of a
volt-coulomb or watt-second. It is equal to
Gram-degree C. .24068
Pound-degree F. .000955
Equivalent, Thermo-chemical.
The calories evolved by the combination of one gram of any substance
with its equivalent of another substance being determined, the product
obtained by multiplying this number by the equivalent (atomic or
molecular weight / valency) of the first element or substance is the
thermo-chemical equivalent. If expressed in kilogram calories, the
product of the thermo-chemical equivalent by 0.43 gives the voltage
required to effect such decomposition.
The following are thermo-chemical equivalents of a few combinations:
Water 34.5
Zinc oxide 43.2
Iron protoxide 34.5
Iron Sesquioxide 31.9 X 3
Copper oxide 19.2
Equivolt.
"The mechanical energy of one volt electro-motive force exerted under
unit conditions through one equivalent of chemical action in grains."
(J. T. Sprague.) This unit is not in general use as the unit of electric
energy, the volt-coulomb and (for rate of electric energy) the
volt-ampere being always used.
Erg.
The absolute or fundamental C. G. S. unit of work or energy. The work
done or energy expended in moving a body through one centimeter against
a resistance of one dyne.
Erg-ten.
Ten millions of ergs, or ten meg-ergs.
Escape.
A term applied to leakage of current.
Etching, Electric.
A process of producing an etched plate. The plate is coated with wax,
and the design traced through as in common etching. It is then placed in
a bath and is connected to the positive terminal from a generator, whose
negative is immersed in the same bath, so that the metal is dissolved by
electrolytic action. By attaching to the other terminal and using a
plating bath, a rough relief plate may be secured, by deposition in the
lines of metal by electroplating.
Synonym--Electric Engraving.