Neutral Wire.
The central wire in the three wire system, q. v., of electric
distribution; the wire connected to a point between the two dynamos, or
otherwise to the central point of the current generator.
Fig. 250. DIAGRAM OF THREE WIRE SYSTEM SHOWING NEUTRAL WIRE.
Neutral Wire Ampere Meter.
An ampere meter connected in the circuit of the neutral wire to
determine the current passing through it. Such determination is for the
purpose of ascertaining how much more work is being done by one of the
lateral leads than by the other.
Synonym--Balance Ampere Meter.
N. H. P.
Symbol or contraction for "nominal horse power." This is a basis for
rating the size of an engine.
Nickel.
A metal; one of the elements; atomic weight, 58.8 ; equivalent, 29.4;
valency, 2; specific gravity, 8.8. It is a conductor of electricity.
Relative resistance, annealed (Silver = 1), 8.285
Specific Resistance, 12.47 microhms.
Resistance of a wire
(a) 1 foot long, weighing 1 grain, 15.206 ohms.
(b) 1 foot long, 1/1000 inch thick, 74.963 "
(c) 1 meter long, weighing 1 gram, 1.060 "
(d) 1 meter long, 1 millimeter thick, .1587 "
Resistance of a 1-inch cube, 4.907 microhms.
Electro-chemical equivalent, (Hydrogen = .0105) .3087 mgs.