Electromotive force – emf, Physics

Assignment Help:

ELECTROMOTIVE FORCE – EMF:

To make use of electricity by provision of an electric current, the potential different must be maintained. That is, the positive and negative charge must be continuously replenished. A cell (or battery) uses chemical energy to maintain the potential difference.

Another device used for this purpose is the generator, which uses electro-mechanical energy to maintain the potential difference. The potential difference across the terminals of the source (cell, battery or generator) when it is not supplying current, is called Electromotive Force (emf), since this is a measure of the force available to push electrons around the circuit. In a circuit with a current flowing, the potential difference across the terminals of the source is always less than the emf and is referred to as the terminal voltage.


Related Discussions:- Electromotive force – emf

Define magnetic field half way between axis and outside edge, A copper rod ...

A copper rod which is 1 centimetre in diameter carries a current of 5 amps.  The current is distributed uniformly throughout the rod.  The magnetic field half way between the axis

Explain about the term pumping in laser, Explain about the term pumping in ...

Explain about the term pumping in laser. Pumping in laser is particular criteria to get laser output. It is same to pumping well water to the ground level or to an overhead tan

Are optical ports compatible, Are optical ports compatible? In general ...

Are optical ports compatible? In general no there are optical ports are not compatible. Illuminator manufacturers use an exacting type of optical port to effect the connection

Illustrate the characteristics of a sound note, Illustrate the characterist...

Illustrate the characteristics of a sound note. What do you mean by Resonance? Illustrate with an example.

Measurement of difference in wavelength, Measurement of Difference in Wavel...

Measurement of Difference in Wavelength of Sodium D1 and D2 Lines: For the measurement of difference in wavelength of two closely spaced sodium lines firstly the M1 is adjusted for

The broken pencil-ray optics, The Broken Pencil-Ray Optics A general cl...

The Broken Pencil-Ray Optics A general classroom demonstration includes placing a pencil (or similar object) within an upright position within a round glass of water. The penci

What is permeability?, It is the property of a material by virtue of which ...

It is the property of a material by virtue of which it allows itself to be magnetized. Permeability varies from material to material depending upon the saturation and temperature.

Lights wave, composition of two simple harmonic vibrations acting at right ...

composition of two simple harmonic vibrations acting at right angles

Determine the frequency spectrum of a signal, Figure shows the frequency sp...

Figure shows the frequency spectrum of a signal at 1184kHz displayed by a high-speed virtual DSO. Determine (a) The harmonic relationship among the signals marked 'o' and 'x',

Instantaneous angular acceleration, Concurrent angular acceleration means a...

Concurrent angular acceleration means angular acceleration at a particular dot instant at t = t 1 mathematically it is given as,

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd