The circulation of electric Charges is recognized as Electricity, and also it is responsible for producing electric current. In this Fast cultivation Era, electrical power has end up being really necessary for human being Beings, native the pan in a small room to the heavy machines in large factories, everything works ~ above Electricity. Critical word linked with power is Electric Potential. A Potential distinction is forced to develop the flow of electrons and hence, produce electricity. Let’s learn around Electric potential and also how a Potential difference is Created.

You are watching: At what point or points on the y-axis is the electric potential zero?

Electric Potential

It is the work done every unit charge in bespeak to bring that charge from infinity to a allude in the electrostatic field versus the ar force. Electrical Potential is likewise referred together Voltage. The SI unit for electrical Potential or electric Potential difference is Voltage or Volts. Electric potential is a scalar quantity.In the above figure, +Q is the charge producing an electric field, the task is to lug a unit fee (+q) indigenous infinity (anywhere external the electric field) to a suggest inside the electric field against the field. Since, the electrostatic force produced by the electrical field will be versus the unit charge, some job-related done is required by the unit charge in bespeak to relocate from either infinity to somewhere in the field, or indigenous one point to another in the field.If the job-related is excellent to relocate the fee from infinity to point X, it will be dubbed as electric potential in ~ X (Vx).If the work-related is done to move the charge from infinity to point Y, It will be dubbed as electrical potential at Y (Vy).If the work is excellent to relocate the fee from X to Y, it will certainly be called as the potential difference between x and y (Vxy).Formula for electric Potential:


Electric Potential/ Voltage = work-related Done / Unit ChargeSI unit for electric Potential:V = W/q = Joules/ coulomb = VoltsTherefore, the SI unit for electrical Potential is Volts or Voltage.1 Volt = 1 Joule/ 1 coulomb1 Volt can be identified as 1 joule of job-related done in bespeak to move 1 coulomb that charge

Electric Potential Difference

Imagine a ball sitting at part height, will there be some power in the ball? Yes, the energy is dubbed as Potential energy and if the ball is dropped indigenous a allude A come B height, the sphere will constantly fall from greater gravitational potential come lower, then there will certainly be a distinction in both the energies. The electrical potential difference is analogical come this concept.
Potential Energy shown of the sphere at elevation A and also B
The power possessed by electrical charges is known as electrical energy. A fee with greater potential will have much more potential energy and the charge through lesser potential will have actually less potential energy. The current always moves from higher potential to reduced potential. The difference in these energies per unit charge is known as the electrical potential difference.


In order to create electricity and the flow of current, a potential distinction is always required which is maintained by a battery or a cell.
A Cell
The longer side represents greater potential (+ve terminal) and also the much shorter side represents reduced potential (- terminal).The electric potential distinction is measure by a Voltmeter i beg your pardon is applied parallel to the Instrument who Voltage is to be measured.
A Voltmeter
Definition of electric potential differenceIt is the occupational done per unit fee to relocate a unit charge from one suggest to an additional in an electric field. Electric potential difference is usually referred together Voltage difference.Formula for electric potential differenceVxy= Vx – Vy = /qSI Unit of electrical Potential DifferenceThe SI Unit of electric potential distinction is exact same as the electrical potential, i.e; Voltage or Volts.Note: Why a unit charge is take away to explain the concept of electric Potential?


A small unit fee will have very tiny electric field which will certainly neither impact not distort the field developed by the enlarge charge and also hence, the ide can be explained easily.

Ohm’s Law

According come Ohm’s Law, The existing flowing v a conductor is directly proportional to the voltage listed the conductivity and temperature stays constant.While remove the proportionality, a new continuous is introduced known together the Resistance.V ∝ IV = IRWhere, V= Voltage throughout the conductorI= existing flowing in the wireR= Resistance offered by the conductor in ohms

Sample Problems

Question 1: A charge of 10mC is moved from infinity to a suggest A in electrical field, the occupational done in this procedure is 20 Joules. What is the Potential difference.Solution:V= W/qW= 20 joulesq= 10mCV= 20/10×10-3= 2kVTherefore, the potential developed is 2000volts.Question 2: A fee of 50mC is moved from one suggest to an additional (from A come B) The voltage in ~ A is 50kV and also the Voltage at B is 30kV, uncover the work-related done by the charge.Solution:VAB= VA– VB= 50kV- 30kV = 20kV


Work done = V× q= 20kV × 50mC= 100 JoulesQuestion 3: What are the SI units of these adhering to quantities,Energy, Potential Difference, Charge, ResistanceAnswer:The SI devices of the above-mentioned quantities:Energy⇢ JoulesPotential Difference⇢VoltageCharge⇢CoulombResistance⇢OhmsQuestion 4: find the present through the circuit once the voltage across the terminal is 30V and the resistance readily available by the conductor is 10ohm.Solution:According come ohms Law,V= IR30V = i × 10ohmI= 3 AmperesTherefore, the present through the circuit is 3 amperes.

See more: Which Of The Following Does Not Occur During The Calvin Cycle? ?

Question 5: What is the difference between Electric Potential and Electric Potential difference.Answer:Electric Potential is the work done every unit charge in order to carry the fee from infinity to a suggest in electric field while electric potential distinction is the Potential occurred while moving a charge from one suggest to an additional in the ar itself.The SI Unit of both electrical potential and also electric potential difference is Volts/ Voltage.Attention reader! Don’t stop learning now. Join the First-Step-to-DSA course for course 9 come 12 college student , specifically designed to introduce data structures and also algorithms to the class 9 to 12 students