Alternating current Sentence Examples
The subjection of the core to a hydraulic pressure of four tons to the square inch and an electric pressure of 5000 volts from an alternating-current transformer has been adopted, by one manufacturer at least, to secure the detection of masked faults which might develop themselves after submergence.
In Squier and Crehore's " Synchronograph " system " sine waves of current, instead of sharp " makes and breaks," or sharp reversals, are employed for transmitting signals, the waves being produced by an alternating-current dynamo, and regulated by means of a perforated paper ribbon, as in the Wheatstone automatic system.
These spark balls are connected either to the secondary circuit of an induction coil I, or to that of an alternating current transformer having a secondary voltage of 20,000 to 100,000 volts.
In order to produce electric oscillations in the system, the first or alternating current transformer must charge the condenser connected to its secondary terminals, but must not produce a permanent electric arc between the balls.
An alternating current of one ampere is defined to be one which produces the same heat in a second in a wire as the unit continuous current defined as above to be one ampere.Advertisement
If a small alternating current is passed through one wire, it sags down, the mirror is tilted, and the spot of light on the screen is displaced.
The second has a very small area, showing that the work done in reversing the magnetization is small; the metal is therefore adapted for use in alternating current trans formers.
In ordinary electrolytic work only the continuous current may of course be used, but in electrothermal work an alternating current is equally available.
The Siemens and Halske ozonizer, in form somewhat resembling the old laboratory instrument, is largely used in Germany; working with an alternating current transformed up to 650o volts, it has been found to give 280 grains or more of ozone per e.
Induction Meters are applicable only in the case of alternating current supply.Advertisement
That this process did not depend upon electrolysis, but was simply an instance of electrical smelting or the decomposition of an oxide by means of carbon at the temperature of the electric arc, is shown by the fact that the Cowles furnace would work with an alternating current.
He also devised an alternating current electrical machine in which the discharge balls were alternately positive and negative.
This invention in conjunction with an alternating current dynamo provided a new and simple form of electric arc lighting.
The alternating current is generally used, the action not being electrolytic. One of the special advantages of the electrical over the older process is that the distilling vessels have a longer life, owing to the fact that they are not externally heated, and so subjected to a relatively high temperature when in contact with the corrosive slag formed in the process.
Cyclo-hexanone, C 6 H 10 0, is obtained by the distillation of calcium pimelate, and by the electrolytic reduction of phenol, using an alternating current.Advertisement
In the point-by-point method the shaft of an alternator, or an alternating current motor driven in step with it, is furnished with an insulating disk having a metallic slip inserted in its edge.
Against this disk press two springs which are connected together at each revolution by the contact of the slip at an assigned instant during the phase of the alternating current.
Three springs press against the cylinder and make contact for a short time during each revolution, so that a condenser is charged by the circuit at an assigned instant during the alternating current phase, and then subsequently connected to a voltmeter.
This process, so to speak, samples or tests the varying electromotive force of the alternating current at one particular instant during the phase and measures it on a voltmeter.
In another form devised by Callendar," a revolving contact disk is placed on the shaft of an alternator, or of a synchronous motor driven by the alternating current under test.Advertisement
If a pair of coils of wire through which an alternating current is passing are placed on either side of the tube, just beyond one of the plates with a hole in it, the field FIG.
Back to Revision Session Index Revision Session Two alternating current Describe what is meant by alternating current.
When these last coils are traversed by an alternating current they induce local or eddy currents in the disk.
In this case both the fixed and movable circuits consist of fine wires, and the instrument is constructed and used in a manner similar to the Siemens dynamometer employed for measuring continuous alternating current (see Amperemeter).
Produce direct current (DC), but special devices called "inverters" can convert solar DC current to alternating current (AC) to power regular appliances.Advertisement
This generator produces energy, either as direct current or alternating current output.