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

.., functions of the time base on the C.R.O

functions of the time base on the C.R.O

What is the type of bonding in silicon, What is the type of bonding in sili...

What is the type of bonding in silicon? (A) Ionic. (B) Covalent. (C) Metallic. (D) Ionic + Metallic Ans: Bonding in silicon is covalent type.

Unit of charges, Unit of Charges: The S.I unit of charge is Coulumb rep...

Unit of Charges: The S.I unit of charge is Coulumb represented by "c".

Tools for performance measurement in parallel algorithm, After the parallel...

After the parallel algorithm has been written as well as executed performance of both algorithms is one of other main concerns. In order to examine performance of algorithms there

Explain about the wave-particle duality of light and matter, Explain about ...

Explain about the wave-particle duality of light and matter. The wave-particle duality of light and matter Into 1690 year Christiaan Huygens theorized which light was compos

Chandrasekhar limit, Chandrasekhar limit (S. Chandrasekhar; 1930) This...

Chandrasekhar limit (S. Chandrasekhar; 1930) This is a limit that mandates that no white dwarf (a collapsed, degenerate star) may be more massive than approximates 1.4 masses

What is electromagnetic induction, Q What is electromagnetic induction? ...

Q What is electromagnetic induction? The phenomenon of producing an induced emf because of the changes in the magnetic flux associated with a closed circuit is known as electr

Simple microscope, calculate the magnifying power of a simple microscope wh...

calculate the magnifying power of a simple microscope whose focal length is 6 cm and the distance of distinct vision of 25 cm

Describe electric current and mobility of charge, Describe electric current...

Describe electric current, mobility of charge and drift velocity carriers in a conductor.Derive the relation between drift velocity of charge carriers and electric current in a con

Fields of force, #questiwhy test charge kept unit ad positive ?on..

#questiwhy test charge kept unit ad positive ?on..

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