e.m.f.

If the motor be unloaded, a certain amount of energy is used: increase the load and the motor automatically takes more current: try to drive the motor from with-out and a back e.m.f. is produced, causing less current to be taken.

Archibald V. Hill - Nobel Lecture 1965

The conduction of heat, the relation between e.m.f. and temperature, the movements of the galvanometer, its dynamics, the control on it for small movements, and its damping, indeed, all the factors connected with the deflection of the galvanometer resulting from the change of temperature of an object in contact with the thermopile, are governed by linear differential equations with constant coefficients.

Archibald V. Hill - Nobel Lecture 1965

This seriously affects the e.m.f. of the cell and also its internal resistance.

Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. George Patterson 1910

This cell requires little attention and will maintain a constant e.m.f. of about two-thirds of a volt until completely exhausted.

Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. George Patterson 1910

The e.m.f. of a cell of this type is 1.03 volts and the external resistance varies with the age of the cell, being about 4 ohms at first.

Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. George Patterson 1910

There are also forces that act on the spin of an electron; it has been recently predicted that, for circuits that are in part composed of ferromagnetic materials, there arises an e.m.f. of spin origin even for a static magnetic field.

Next Big Future 2009

The electromotive force (e.m.f.) predicted by Faraday's law reflects the forces acting on the charge, - e, of an electron moving through a device or circuit, and is proportional to the time derivative of the magnetic field.

Next Big Future 2009

The potential difference at the terminals of a battery exceeds the e.m.f. whenever the current flows through the battery in the reverse direction.

LearnHub Activities 2009

Here we show that such an e.m.f. can indeed be induced by a static magnetic field in magnetic tunnel junctions containing zinc-blende-structured MnAs quantum nanomagnets.

Next Big Future 2009

The huge magnetoresistance and e.m.f. may find potential applications in high sensitivity magnetic sensors, as well as in new active devices such as

Next Big Future 2009