Electromotive force – emf, Physics

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.

Posted Date: 9/13/2012 1:34:45 AM | Location : United States







Related Discussions:- Electromotive force – emf, Assignment Help, Ask Question on Electromotive force – emf, Get Answer, Expert's Help, Electromotive force – emf Discussions

Write discussion on Electromotive force – emf
Your posts are moderated
Related Questions
The characteristic of a body by virtue of which the body takes its real configuration when external deforming forces are removed is called as elasticity.

what is clamper

Can fiber be made any size? Well theoretically, yes. However, there are physical constraints due tothe materials and utility. Extremely large fibers have proportional bending r

How do you separate Hydrogen and Oxygen gases in industrial electrolysis of water process? In electrolysis, oxygen and hydrogen gas are formed at dissimilar electrodes (oxygen

As regards cases involving the application of the Biot-Savart Law to calculate the magnetic field due to an electric current which of the following statements about why it is relat


A 100V battery is linked across a resistor and causes a current of 5mA to ?ow. Verify the resistance of the resistor.  If the voltage is now decreased to 25V, what will be t

Car Rear Ends Truck Collisions among objects are governed through laws of momentum and energy. While a collision occurs within an isolated system, the total momentum of the sys

The lead alloy: Most of the soldering in the electronic industry is carried out using tin lead alloy. Pure lead metals at 327 0 C, whereas tin melts at 232 0 C and the mixture of

A bar magnet having of two equal and opposite magnetic pole separated by a small distance. Poles are not precisely at the last. The smallest distance among two poles is known as ef