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 there any way to get zero gravity on the earth?, Yes it is possible at t...

Yes it is possible at the centre of the earth where the radius is zero .

N-type semiconductor, Consider a pentavalent impurity such as phosphorus (P...

Consider a pentavalent impurity such as phosphorus (P, Z = 15) is doped in a pure semiconductor germanium (Ge, Z = 320. Each phosphorus atom forms four covalent bonds with four ger

Determine chamber reading and value to radiation exposure, 1. An ionization...

1. An ionization chamber is used on Tuesday (T=22°C, P=760mmHg) and then on Wednesday (T=25°C, P=740 mmHg) to monitor the output from an x-ray tube. If the output from the tube is

Explain about the term intrinsic sensors, Explain about the term intrinsic ...

Explain about the term intrinsic sensors. Intrinsic sensors: Optical fibers can be utilized as sensors to measure temperature, strain, pressure and other quantities by chang

Explain about centrifugal force, Q. Explain about Centrifugal force? Th...

Q. Explain about Centrifugal force? The centrifugal force is F c =mv 2 /r, Where r is the radius of the orbit and m is the mass of the object and v is the velocity. The

Law of reflection, The Law of Reflection While a ray of light strikes a...

The Law of Reflection While a ray of light strikes a plane mirror and the light ray reflects off the mirror. Reflection includes a change within direction of the light ray. The

SOUND, Explain and write about sonar

Explain and write about sonar

Illustrate what is the geocentric, Q. Illustrate What is the geocentric? ...

Q. Illustrate What is the geocentric? Answer:- It is science where the earth is the midpoint of the solar system and the other planets and the sun revolve around the earth

Mechanical stressing, Mechanical stressing: When a material undergoes a me...

Mechanical stressing: When a material undergoes a mechanical treatment, its resistivity changes due to mechanical distortion of the crystal structures. The localized strain produc

What do you mean by mobility, Q Define: mobility. Give its unit. The mo...

Q Define: mobility. Give its unit. The mobility is defined as the drift velocity obtains per unit electric field. The unit of a mobility m 2 V 1s 1.

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