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

What is an optical fibre, Q. What is an optical fibre and dispersion? Write...

Q. What is an optical fibre and dispersion? Write the expression for angle of deviation.

How is energy transformed in windmills, How is energy transformed in windmi...

How is energy transformed in windmills? Essentially what occurs is that as the energy from the wind rotates the vanes of the mill, coils of wire move inside a permanent magnet

Universal Gravity, There is a point between the Earth and the Moon where th...

There is a point between the Earth and the Moon where the gravitational effects of the two bodies balance each other. Calculate the distance from the center of the Earth to this po

#title.kinematics., what is the difference between diplacement and distance...

what is the difference between diplacement and distance

Fresenls diffraction, working and construction of fabry perot interferomete...

working and construction of fabry perot interferometer

Heat equation + matlab, I need to solve and write a MATLAB code the heat eq...

I need to solve and write a MATLAB code the heat equation by two methods ( Crank-Nicolson method and asymptotic method )

Velocity distribution in a rectangular channel, An approximate equation for...

An approximate equation for the velocity distribution in a rectangular channel with turbulent flow is where umax is the velocity at the surface, y is the distance from the

Distinguish between diamagnetic and ferromagnetic materials, Distinguish am...

Distinguish among diamagnetic and ferromagnetic materials in respect of their (i) intensity of magnetisation, (ii) behaviour in a non-uniform magnetic field and (iii) susceptibilit

What do the negative sign tell you about the image, Q. What do the negative...

Q. What do the negative sign tell you about the image? A single lens is utilized to form an image of an actual physical object. You compute the image position i and find that

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