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

Digestion sytem, what is the substance produced in the liver that acts in t...

what is the substance produced in the liver that acts in the small intestine during digestion?

Introduction and definition of coulomb’s law, Introduction and Definition: ...

Introduction and Definition: The force between two particles was studied by Coulomb in 1785.  He stated that the force of attraction or repulsion between two charged particle

Importance of physics, how to write aasignment on importance of physics

how to write aasignment on importance of physics

Determine the polarizing angle, The refractive index of glass is 1.54....

The refractive index of glass is 1.54. Determine the polarizing angle when light goes from glass to air medium?

Expermient of a sensitive beam balance, A sensitive beam balance The ma...

A sensitive beam balance The materials required for this balance contain a clothes peg, a knitting needle about 12 in. long, two pins or needles and a support like as a milk bo

Calculate the temperature after compression, A substance has constant heat ...

A substance has constant heat capacity C P = 3.5R and its equation of state is given by: P (V-cRT) = RT where c = 5 * 10 -7 m 3 /J. This substance is isentropically compre

Refraction - ripple tank , In a ripple tank two regions A and B can be crea...

In a ripple tank two regions A and B can be created by introducing a pile of glass plates in region B. Thus region B is a shallow water region while region A is a deep water re

Volt meter, Ask question #Minimum 200 words accepted#

Ask question #Minimum 200 words accepted#

What is the magnitude of the electric field in capacitor, Five volts are ap...

Five volts are applied across the plates of a parallel plate capacitor. The distance of separation of the plates is .02 meters. What is the magnitude of the electric field i

Constraint relation : wedge and block, A block goes on a wedge which in tu...

A block goes on a wedge which in turns goes on a horizontal table, as given in figure. The wedge angle is Φ. As long as the wedge is in met with table, we have the trivial const

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