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

Determine the forward current for a forward voltage, The graph shown in Fig...

The graph shown in Figure was obtained during an experiment on a diode. (a) What type of diode is this? Give reasons. (b) Determine the forward current for a forward voltage

Evaluate the linear distance on the screen, Light from a monochromatic sour...

Light from a monochromatic source of wavelength 4000A 0 is incident on a grating having 5000 rulings / cm. The spectrum is focused on a screen by a lens of focal length

Quantum mechanicm, compton effect and quantum nature of light

compton effect and quantum nature of light

Intersections, about beam intersection in gama and alpha beam?

about beam intersection in gama and alpha beam?

Health , how do my boobs get so big ang why do i have hair down there

how do my boobs get so big ang why do i have hair down there

Evaluate the total volume and the density of the sample, An ore sample weig...

An ore sample weighs 17.50 N in air. When the sample is suspended by a light cord and totally immersed in water, the tension in the cord is 11.20 N. Find the total volume and the d

What happens if or electrical joint is loose, What occurs if electrical con...

What occurs if electrical connection or electrical joint is loose? Ans: Because of loose connection at joints resistance at that point will increase thereby the I²R loses ar

Explain the merits of vacuum diode over semiconductor diode, Explain the Me...

Explain the Merits of Vacuum Diode over Semiconductor Diode (i)  Vacuum Diodes can withstand high reverse voltages (ii)  Vacuum Diodes can operate at fairly high temperature

Determine watts of power dissipated for potential difference, The constant ...

The constant potential difference across a 2 ohm resistor is 20 volts. How many watts of power are dissipated by this resistor? Ans: 200 watts of power are dissipated throug

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