The electromotive force of a cell is independent of the size and depends only upon the materials used; but the current which a battery can deliver varies directly with its size.
Any cell whose electromotive force is not fully equal to the others will absorb energy and be charged by the others.
From calculations, based on Jahn's accurate measurements of the electromotiveforces of concentration cells, A.
To quote from a section entitled "Induction Heating" from an electrical engineering textbook: A rod of solid metal or any electrical conductor, when subjected to an alternating magnetic field, has electromotive forces set up in it.
These electromotive forces cause what are known as "eddy currents.
One of these factors is inductance, by which is meant the counter-electromotive force that is always present and opposed to the regular voltage in an alternating current circuit.
The single cell giving not much more than a volt of electromotive force will not send sufficient current through the lamp filament to render it incandescent.
Opposed to the effect of the volts of electromotiveforce is the resistance of the circuit, which is measured in ohms.
Thus one is led, from theoretical and practical considerations, to the use of high frequencies, and this means high electromotive forces and small currents in the primary.
When he works with condenser charges--and they are the only means up to the present known for reaching these extreme frequencies--he gets to electromotive forces of several thousands of volts per turn of the primary.
By taking any number of spaces the experimenter has a rough idea of the electromotive force, and he finds it easier to repeat an experiment, as he has not the trouble of setting the knobs again and again.
With superposition of stimuli, a relatively high value is obtained in tin, amounting sometimes to nearly half a volt, whereas in silver the electromotive variation is only about ·01 of this value.
The intensity of the response, however, does not depend on the chemical activity of the substance, for the electromotive variation in the relatively chemically inactive tin is greater than that of zinc.
The electromotivevariation varies with the substance.
The primary condenser therefore serves to increase the suddenness with which the primary current is interrupted, and so greatly increases the electromotive force in the secondary circuit.
This interrupted flow of electricity through the primary circuit provides the intermittent magnetization of the core necessary to produce the secondary electromotive force.
This adjustment for balancing an unknown electromotive force is accomplished by the manipulation of the two contact points M and M'.
An electromotive force has been defined as that which causes or tends to cause a current; it is analogous to water pressure; potential difference corresponds to difference of level.
This is to provide a path for the discharge of the induced electromotive force.
As the armature of the motor continues to operate, due to its inertia, it generates an electromotive force which sends a current through the shunt connected field circuit and helps to maintain the field excitation.
To compare electromotive forces by this method, place the battery connection (fig.
Compared with high resistance potentiometer, this is especially advantageous in measuring the electromotive force of thermocouples, and the fall of potential across standard low resistances.
The total electromotive force of a circuit is independent of resistance or current, and cannot be limited to mean the fall of pressure between any two points, as for instance the terminals of a battery.
Commutator plug setting for comparing electromotive forces by the fall of potential method with Queen acme set.
The temperature of maximum electromotive force was found to be independent of the temperature of the colder junction.
It is the resistance of the circuit of slider, rails, and connecting wire, when with this electromagnetic unit of electromotive force the unit of current is made to flow.
The magneto-electric machine imagined in the former paper gave a means of estimating the electromotive force of a cell or battery in absolute units.
For rapid signalling in which very quick changes of current are concerned the electromotive forces due to the growth or dying out of the current would be serious, and the theory of diffusion would not apply.
But this electromotive force, which is proportional to the current in the coil, is equal to the product of the resistance of the wire and the same current, or a known fraction of it.
But ordinary cable working is quite slow enough to enable such electromotive forces to be disregarded.
Thus the electromotive force of the disk was opposed by a back electromotive force θε due to the chemical action in the voltameter or battery, to which the wires from the disk were connected.
In the next paper, which appeared in the same number (December 1851) of the Philosophical Magazine, the principle of work is applied to the measurement of electromotive forces and resistances in absolute units.
When a condenser discharges through an oscillation circuit, where there is no outside electromotive force acting on it, the oscillations are said to be free.
Footnote: Strictly speaking it is the difference of potential that sets up the electromotive force.
The electromotive force which produces a current of 1 ampere when steadily applied to a conductor the resistance of which is one ohm.
The inductance in a circuit in which the electromotive force induced is 1 volt when the inducing current varies at the rate of 1 ampere per second.
The important fixed relation between the electric current, its electromotive force and the resistance of the conductor in which it flows.
The unit of electromotive force is the volt, and this is the electric pressure which will force a current of 1 ampere through a resistance of 1 ohm; it is expressed by the symbol E.
The simplest experimental method of directly determining chemical affinity consists in the measurement of electromotive force.
The unit of electromotive force, the volt, may be defined as the electromotive force that will drive a current of 1 ampere through the resistance of 1 ohm.
By analogy that which is exerted by a battery or by a dynamo in causing current to flow is called an electromotive force.
The relation between the electromotive force applied to a circuit, its resistance, and the current produced was discovered in 1827 by George Ohm.
What conditions in a voltaic cell will give a strong electromotive force.
What conditions in a voltaic cell will give a steady electromotive force.
Ohm's law, one of the most important laws of electricity, states that, in any circuit, the current in amperes equals the electromotive force in volts divided by the resistance in ohms.
A difference of potential is therefore often called an electromotive force (E.
In this condition there is complete electrical insulation between the jets, as may be proved by the inclusion in the circuit of a delicate galvanometer, and a low electromotive force.
The tension of the surface of contact of mercury and dilute sulphuric acid depends on the electromotive force acting between the mercury and the acid.
If the electromotive force is from the acid to the mercury the surface-tension increases; if it is from the mercury to the acid, it diminishes.
Lippmann, who has made a careful investigation of the subject, finds that exceedingly small variations of the electromotiveforce produce sensible changes in the surface-tension.
On having been verified with a standard voltaic cell the apparatus becomes itself a standard, especially for small electromotive forces.
The fractional electromotive force is obtained by means of a sliding contact which cuts out so many pairs as is required.
For higher electromotive forces than a volt, several of these piles would have to be connected in series.
It results from this that as soon as we propose to obtain an electromotive force, however slight it be, we must get it with machines of large dimensions.
In some cases the value of this electromotiveforce between two points or conductors is independent of the precise path selected, and it is then called the potential difference (P.
This sum, or integral, is called the "line integral of electric force" or the electromotive force (E.
Owing to the confusion introduced by the employment of the term force, Maxwell and other writers sometimes use the words electromotive intensity instead of electric force.
In practice the word "current" is used to designate ampere flow; and electromotive force, or E.
Installing Counter Electromotive Force Cells Counter EMF cells, if used with a battery, are installed in the same manner as regular cells.
The furnace at present in use is charged in substantially the same manner, and the current is supplied by a Brush machine of variable electromotive force driven by an equivalent of forty horse power.
This result was obtained by direct transmission, and without an induction coil, and it is probable that it might be much exceeded without sensibly increasing the electromotive force of the current.
The electromotive energy called into action in these dry piles is less than that excited in the moist or hydro-electric piles, principally on account of the imperfect conduction of the paper.
The battery has rather greater electromotive force when this regenerated lye is used, because certain foreign matters from the carbon, like sulphur, chlorine, sulphuric acid, etc.
The electromotive power of this element may be as high as 1.
This resistance is thrown in or out by means of a motor device actuated by an electromotive force indicator.
There are several devices by which it has been found possible to enable a dynamo to maintain a constantelectromotive force, even if the speed of rotation varies over considerable limits.
With the aid of such a governor it is possible to drive a dynamo from a mill shaft providing the requisite power, but of which the speed of rotation is not sufficiently uniform to secure alone efficient regulation of electromotive force.
Accordingly, within certain limits, theelectromotive force of the dynamo is independent of the speed of rotation.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "electromotive" in a variety of sentences. We hope that you will now be able to make sentences using this word.
