What role does potential difference play in electric current?

According to Fluid Mechanics, water always tries to flow from high pressure to low pressure. According to Thermodynamics, Heat flows from high temperature to low temperature. Similarly electrons tries to flow from high potential to low potential. read more

When there is a same potential(No Potential Difference). electrons does not flow, So no current. When there is a Potential Difference between two terminals in a wire, electrons flows in between two terminals, current is not equal to zero. read more

The electric potential difference across a light bulb (or any resistor) in an electric circuit is simply the product of the current at that bulb multiplied by the resistance of the bulb. Each bulb has the same resistance (since they're identical) and the same current (since the current is everywhere the same). read more

This part of Lesson 1 will be devoted to an understanding of electric potential difference and its application to the movement of charge in electric circuits. Consider the task of moving a positive test charge within a uniform electric field from location A to location B as shown in the diagram at the right. read more