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## Class 10 Physics (India)

### Unit 3: Lesson 3

Circuits, Ohm's law & resistance

# Solved example: Ohms law

Let's solve a couple of numerical on Ohm's law.  Created by Mahesh Shenoy.

## Want to join the conversation?

• *Is there a difference between electric potential and electric potential energy?*
• The basic difference between electric potential and electric potential energy is that Electric potential at a point in an electric field is the amount of work done to bring the unit positive charge from infinity to that point, while electric potential energy is the energy that is needed to move a charge against the electric field.
The gravitational potential at a point in the gravitational field is the gravitational potential energy of a unit mass placed at that point. In this way, the electric potential at any point in the electric field is the electric potential energy of a unit positive charge at that point.
If W is the work done in moving a unit positive charge q from infinity to a certain point in the field, the electric potential V at this point is given by:
V = W/q
It implies that electric potential is measured relative to some reference point and like potential energy we can measure only the change in potential between two points.
Electric potential is the scalar quantity. Its unit is volt which is equal to joule per coulomb (J/C).