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

Is cph a quantum energy unchangeable, Is CPH a quantum energy unchangeable?...

Is CPH a quantum energy unchangeable? Answer- Yes, the quantum energy (photon) is made of lots CPH, different between photons depend to the number of CPH that they are made of.

Illustrate kirchhoffs law in electricity, Illustrate Kirchhoff's law in ele...

Illustrate Kirchhoff's law in electricity and apply them to Wheatstone bridge to get its balancing condition. Illustrate the basic principle of meter bridge. Define an experimen

Drawbacks of a simple pendulum, Although one of the easiest methods for ver...

Although one of the easiest methods for verifies the value of g at a place a simple pendulum suffers from a number of limitations, the more significant of which are the following:

Illustrate about laser beam welding in short, Illustrate about laser beam w...

Illustrate about laser beam welding in short. Laser beam welding: Laser beam welding (LBW) is a welding technique utilized to join multiple pieces of metal by the use of a l

Compute the wavelength of the light, Q. In Young's double slit experiment t...

Q. In Young's double slit experiment the distance between the slits is 1.9 mm. The distance between the slit and the screen is 1 m. If the bandwidth is 0.35 mm Compute the waveleng

Electric, What makes a flashlight suddenly become dim or bright when you sh...

What makes a flashlight suddenly become dim or bright when you shake it?

Ehrenfest paradox, Ehrenfest paradox (Ehernfest, 1909) The special rel...

Ehrenfest paradox (Ehernfest, 1909) The special relativistic "paradox" including a quickly rotating disc. As any radial segment of the disc is perpendicular to the direction o

What is the significance of poynting vector, Write down the differential fo...

Write down the differential form of Poynting theorem. What is the significance of Poynting vector?

Direct current, A) Explain the flow of direct current? ( describe direct...

A) Explain the flow of direct current? ( describe direct current) b) Explain  the effect of resistance in circuits? (Describe  effect of resistance)

Draw the circuit diagram of a common-emitter amplifier, Draw the circuit di...

Draw the circuit diagram of a common-emitter amplifier using an n-p-n transistor, Draw the Input and 1p waveforms of the signal. Write the expression for its voltage gain

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