For Chemistry Tutorials
Introduction
 
Vectors
 
Mechanics
 
Energy Work Power
 
Impulse Momentum
 
Rotational Motion
 
Optics
 
Properties Of Matter
 
Heat Temperature And Thermal Expansion
 
Electrostatics
 
Electric Current
 
--Electric Current and flow of Charge
 
--Ohm's Law Resistance and Resistors
 
--Combination of Resistors
 
--Common Electric Circuits and Combination of Batteries
 
--Alternating Current and Direct Current and Diodes
 
--Electric Power and Energy
 
--Finding Potential Difference Between Two Points in Circuits with Examples
 
--Electric Current Cheatsheet
 
Magnetism
 
Waves
 
Exams and Problem Solutions
 
Old Version
 


Menu

Finding Potential Difference Between Two Points in Circuits with Examples


Finding the Potential Difference between the Two Points in Circuits

Potential difference between two points in circuit is the energy lost by the charge in being transferred from one point to another. For example, potential difference between A and B is found with following formula;

VAB=VB-VA=∑ε-∑i.R

This formula shows the energy lost by charge moving from point A to point B.

We should first find the direction of the current to determine values ∑ε and ∑i.R. If you take the sign of batteries having same direction with current as “+” then you must take oppositely connected batteries as “-“.

If the direction of the current and current passing through the resistor are the same then we take i.R as "+", if they are in opposite directions then we take i.R as "-".

In the circuit given below, if the direction of the current is shown like below, then potential difference between the points A-B and C-B are;


VAB=VB-VA= -ε2-(+i.R1+i.R2)

VCB=VB-VC= -ε3-(-i.R3)

Example: Find the potential difference between the points A and B in the given circuit below.

Current of the circuit is in the direction of battery current.

Example: Find the power of the resistor R1.

εeq21=34V-10V=24V

Equivalent resistance of the circuit is;

Electric Current Exams and Solutions


Author:


© Copyright www.PhysicsTutorials.org, Reproduction in electronic and written form is expressly forbidden without written permission of www.PhysicsTutorials.org. Privacy Policy