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

Medicines. radio isotopes, Medicines: 1. Iodine 131 is used for the stud...

Medicines: 1. Iodine 131 is used for the study of thyroid glands. 2. Radiation in low dosage can also be used for sterilizing bandages. 3. Radio-Cobalt-60 has been widely

Laurent''s half shade device (polari meter), It consists of two semis circu...

It consists of two semis circular plates. One is of quartz and other is glass plate joined together along the diameter. The quartz semi circular plate is a half wave plate whose

Project, comparison of magnetic moments using an vibrational magnetometer

comparison of magnetic moments using an vibrational magnetometer

Magnetic susceptibility and ferromagnetic substances, Magnetic Susceptibili...

Magnetic Susceptibility and Ferromagnetic Substances: Magnetic Susceptibility: The magnetic susceptibility (c) of a substance is defined  as the ratio of the intensity of magn

What is the efficiency in an adiabatic proces?, Any thermodynamic procedure...

Any thermodynamic procedure which takes place in a system without the exchange of heat with the surroundings.

What are the limitations of transmission electron microscope, What are the ...

What are the limitations of transmission electron microscope? Limitations of transmission electron microscope: a. In TEM, the materials need extensive sample preparation; we

Angular Acceleration of Earth, 2. The earth’s rotation about its axis chang...

2. The earth’s rotation about its axis changes measurably over time; see http://en.wikipedia.org/wiki/Leap_second and http://en.wikipedia.org/wiki/Tidal_acceleration for detai

Estimate the value of energy of dissociation, 1. The probability of dissoci...

1. The probability of dissociation of water into H + and OH - , to a good approximation, can be characterized by the Boltzmann distribution:  W ≈ e -Eα/ KT If, at 27°C, 1.

Bernoullis theorem, what is the theory behind bernoullies theorem?

what is the theory behind bernoullies theorem?

Iluustrate huygens principle, State Huygens' Principle. With the help of a ...

State Huygens' Principle. With the help of a suitable diagram, prove Snell's law of refraction using Huygens' Principle.

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