Potential difference, Physics

Assignment Help:

Potential difference:

When charges move from one point to another, it is not the actual values of potential at those points which are Important, but the potential different (pd) through which the charge has travelled. Just as lifting weight in the gymnasium, the height above sea level is not important, but the distance between the gym floor and the height of one's body. In cases where an actual level of potential is required, the zero of potential is taken as Earth and whenever the potential at a point is given, it means the difference in potential between the point and the earth's surface.

If one coulomb of electricity requires one joule of work to move it between two points, then there is a potential difference of 1 volt between them. It is sometimes helpful to think of potential difference as a difference of ‘electrical pressure' forcing a current through a load.

If a current flows round a circuit, then a potential difference must exist between any two points in that circuit and each point in the circuit must be at a different potential. However because there is very little opposition to current flow in conducting wires, very little potential difference is required to push the current along the wires and it is normally assumed to be zero. Whenever the opposition to current flow is not negligible, then a potential different exists across that component to push the electrons through the device

The converse is also true, if no current is flowing, then no potential difference exists. The larger the potential difference the larger the current.


Related Discussions:- Potential difference

Calculate the temperature after compression, A substance has constant heat ...

A substance has constant heat capacity C P = 3.5R and its equation of state is given by: P (V-cRT) = RT where c = 5 * 10 -7 m 3 /J. This substance is isentropically compre

Explain time of flight, TIME OF FLIGHT: "It is the total time for which...

TIME OF FLIGHT: "It is the total time for which the projectile remains in air". As, the body goes up and comes back to similar level, so it does not cover vertical distance,

Determine the tension in the cable, The tree needs to fall uphill even thou...

The tree needs to fall uphill even though it is leaning downhill.  The felling notch at O is sufficiently large so that the resisting moment at O is negligible.  The trunk above po

Determine traveling of a ball, A ball falling vertically from rest for 3 se...

A ball falling vertically from rest for 3 seconds travels very nearly: a) 14.7 meters b) 29.4 meters c) 44.1 meters d) 88.2 meters Ans: A ball falling ve

Show the equilibrium under a flexible exchange rate, Q. Under fixed exchan...

Q. Under fixed exchange rate, show using a figure, the effects of an expansionary fiscal policy. Show the equilibrium under a flexible exchange rate. Discuss the difference in t

Explain the energy and mass, Explain the Energy and Mass Albert Einstei...

Explain the Energy and Mass Albert Einstein described an intricate relationship between matter and energy.  It is summarized in the famous formula: E = mc 2   In this equ

What are the wave fronts, Q. What are the wave fronts? Answer:- (Ph...

Q. What are the wave fronts? Answer:- (Physics) A wave front is an fantasy surface joining all points in space that are reached at the same instant by a wave propagating th

Explain state of motion, State of Motion: Inertia is the tendency of an...

State of Motion: Inertia is the tendency of an object to resist alters in its state of motion. State of motion of an object is described by its velocity - speed with a direc

What are major fiber sensors, What are major fiber sensors? Major Fiber...

What are major fiber sensors? Major Fiber Sensors: a. Point sensors: Bragg gratings extended period gratings, Fabry-Perot interferometers. Maximum temperature can be as high

Projectile motion, write all equationes of projectile motion used in calcul...

write all equationes of projectile motion used in calculation of vertical and horizontal motion

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