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

Illustrate how do you convert from pascal to torr, Q. Illustrate how do you...

Q. Illustrate how do you convert from Pascal to torr? Answer:- Converting the Pascal to the torr The pascal is a slighter unit of pressure than the torr and there are 1

Factors on which magnetic force depends, Factors on which Magnetic Force De...

Factors on which Magnetic Force Depends: The magnetic force depends on following factors: 1. Nature of Pole: Like poles repel each other and unlike pole attract each other.

Expression for the energy stored in a capacitor, Derive a mathematical expr...

Derive a mathematical expression for the energy stored in a capacitor. What is the energy stored when the space between the plates is filled with a dielectric a) With chargi

Why don''t diode as a battery?, Why because it is not a source as Li-ion ba...

Why because it is not a source as Li-ion battery. If we want to measure the voltage(build in voltage) with in the diode we have to use the external source. We can''t directly measu

Measuring with a micrometer caliper, Measuring with a Micrometer Caliper ...

Measuring with a Micrometer Caliper A simple animation of using a micrometer to measure the width of a pencil.

Can a solid and liquid together be possible, Can a solid and liquid togethe...

Can a solid and liquid together be possible? Actually, substances can exist in all three states of matter concurrently if the conditions are right. The triple point of a substa

Light emitting diode, Specially designed diodes, which give out light radia...

Specially designed diodes, which give out light radiations when forward biases. LED'S are made of GaAsp, Gap etc.

Determine displacement current density, In free space electric field intens...

In free space electric field intensity is provided as E= y 20 cos (ωt-50x) volt/m. Determine displacement current density.

Electric charge, What is electric field and formula for electric field is?

What is electric field and formula for electric field is?

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