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

Expression for the period of oscillation of a bar magnet, Derive a mathemat...

Derive a mathematical expression for the period of oscillation of a bar magnet in vibration magnetometer. How do you differentiate Dia, Para and Ferromagnetisms in matter.

Explain scalars and vectors, Explain Scalars and Vectors This is one of...

Explain Scalars and Vectors This is one of the harder ideas to get used to when you start learning physics. The trick is to see that there is one basic difference between a sca

Define the introduction about schrödinger’s atom, Define the introduction a...

Define the introduction about Schrödinger’s Atom. Introduction to the Schrödinger’s Atom: To describe the spectral line puzzle, Bohr came up along with a radical model of t

Wave optics: oscillation of particle, In forced oscillation of a particle, ...

In forced oscillation of a particle, the amplitude is maximum for a frequency  ω1 of the force while  the energy is maximum for a frequency  ω2 of the force, then what is relations

Angle calculate by a body be projected, At what angle should a body be pr...

At what angle should a body be projected with a given velocity 24m/s just to pass over the obstacle 14m high at a given distance of 24m. Solution:   14=24xtan(θ)-(g*)(24 2

Define coercive force., It is the demagnetising force which is necessary to...

It is the demagnetising force which is necessary to neutralize completely the magnetism in the magnetism material after the external magnetic field is reduced to zero.

How do you find your body volume using a tape measure, Q. Illustrate how do...

Q. Illustrate how do you find your body volume using a tape measure? Answer:- Correctly measure a container into which your body will fit comfortably. Previously you recog

What are the sources of dispersion in optical fibers, What are the sources ...

What are the sources of dispersion in optical fibers? Sources of Dispersion into Optical fibers: The key sources of dispersion of pulses within optical fibers can be catego

Cart and the brick momentum and collisions, Cart and The Brick Collisio...

Cart and The Brick Collisions among objects are governed through laws of momentum and energy. While a collision occurs in an isolated system, a total momentum of the system of

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