1_Potential difference and electric potential-by-Diwakar Karuppiah
Channel: P6 Scholars Academy
Date: 2020-06-21

Potential difference: 
Consider a point charge +q located at a point ‘O’. let A and B be two points in its   electric field. When a test charge q_0   is moved from A to B, a work w_AB has to be done inmoving against the repulsive force exerted by the charge +q. we then calculate the potential difference between points A and B by the equation.
V=V_B-V_A=W_AB/q_0                                       →(1)
SI unit of potential difference is VOLT(V).
1 Volt=(1 joule)/(1 coulomb)
1 V=1NmC^(-1)=1 JC^(-1)
Electric potential:
                               The electric potential at a point located far away from a charge is taken to be zero. If the point A lies at infinity, then  V_A=0, so that 
V=V_B=W/q_0 
w→ amount of work done in moving the test charge q_0 from infinity to the point B and V_B refers to the potential at point B.
So the electric potential at a point in an electric field is the amount of work done in moving a unit positive charge from infinity to that point against the electrostatic forces.
Electric potential=(work done)/charge  
SI unit of electric potential is volt (v).