UNIT ELECTROMOTIVE FORCE, or unit DIFFERENCE OF POTENTIAL exists between two points when the unit quantity of electricity in passing from one to the other will do the unit amount of work.
UNIT RESISTANCE is that of a conductor through which unit electromotive force between its ends can send a unit current.
UNIT CAPACITY is that of a condenser which contains unit quantity when charged to unit difference of potential.
IV. MAGNETIC UNITS.—
UNIT MAGNETIC POLE is that which repels an equal and similar pole at unit distance with unit force in air.
STRENGTH OF MAGNETIC FIELD at any point is measured by the force which would act on a unit magnetic pole placed at that point.
UNIT INTENSITY OF FIELD is that intensity of field which acts on a unit pole with unit force.
MOMENT OF A MAGNET is the strength of either pole multiplied by the distance between the poles.
INTENSITY OF MAGNETISATION is the magnetic moment of a magnet divided by its volume.
MAGNETIC POTENTIAL.—The potential at a point due to a magnet is the work that must be done in removing a unit pole from that point to an infinite distance against the magnetic attraction, or in bringing up a unit pole from an infinite distance to that point against the magnetic repulsion.