300
Molesworth's pocket-book
Standabds of Electrical Resistance.
(Committee of British Association, 1863J
I UND AMENTA L UNITS.
Length = L. Time = T. Mass = M.
BEKIVKD mechanical vjrns.
WOrt = ;W. = ^2t. Force
1 Ta
Velocity = V = t.
DERIVED MAGNETICAL UNITS.
Strength of the pole of a magnet.. m = L* T ~ 1M*.
Moment of a magnet ..............ml = lA T ~1M *
Intensity of magnetic field .. .. H - L~ * T“1 M*
EJ-EGIBOMAGNETIC SYSTEM OF UNITS.
Quantity of ejectricity.........Q_.yx
Strength of electric current .. .. C = l) T ~1
Electromotive force ............E = lJ> T ~ 2
Resistance of conductor...........R = L T”
ELECTROSTATIC SYSTEM OF UNITS.
Quantity of electricity .. .. .. 3 = L^T—IM^
Strength of electric currents .. .. c~I^ t~2m(
Electromotive force .. ,. .. e = L* T — 1 m(
Resistance of conductor.........r = L ~ 1 T.
I^et v be the ratio of the electrostatic to the electromagnetic
unit of quantity; then v— 310,740,000 metres per second
approximately, and we have
5 = t>Q; c = 1,C; e = lE:
V
r ~ R; *=ip s.