This plan likewise allows of converting high tension discharges of one direction into low tension unidirectional currents, by adjusting the circuit so that there are no oscillations.
If we limit our consideration to the case of continuous unidirectional conduction currents, then the relation between current and E.
A periodic or alternating current is said to have a value of 1 ampere if when passed through a fine wire it produces in the same time the same heat as a unidirectional continuous current of 1 ampere as above electrochemically defined.
LC 4L^2 These expressions show that in the first case the discharge current of the jar is always in the same direction and is a transient unidirectional current.
At the time when Maxwell developed his theory the dielectric constants of only a few transparent insulators were known and these were for the most part measured with steady or unidirectional electromotive force.
In electrokinetic investigations we are most commonly limited to the cases of unidirectional continuous and constant currents (C.
Scarificators in which the blade rods turned in opposite directions (called "reversible" scarificators in trade catalogs) were more complicated to manufacture and therefore somewhat more expensive than unidirectional scarificators.
Two support rods and two cantilever springs were needed in place of the one in unidirectional scarificators.
Hence when arc lamps have to be worked off an alternating-current circuit for public lighting it is now usual to make use of a rectifier, which rectifies the alternating current into an unidirectional though pulsating current.
In some cases the alternating high-tension current is rectified and supplied as a unidirectional current to lamps in series.
We have next to consider the effect of the addition of more armature loops in the case of dynamos which give a unidirectional E.
It results that the homopolar principle, which would prima facie appear specially suitable for the generation of a unidirectional E.
