Movement of Electrons (Current) & Potential Difference (Voltage

 Movement of Electrons (Current) 

                       When an electrical potential difference is applied across the metallic wire, the loosely attached free electrons start moving towards the positive terminal of the cell. This continuous flow of electrons constitutes the electrical current. The flow of currents in the wire is from the negative terminal of the cell to the positive terminal through the external circuit.

Electric current is defined as the rate of flow of negative charges of the conductor or semiconductor. In other words, the continuous flow of electrons in an electric circuit is called an electric current.

Unit of Current: The ampere is the SI unit of the Current. The I is the symbolic representation of the current. 

To understand the Movement of Electrons (Current); please click the link below https://www.youtube.com/watch?v=t6pqrkWSWL8

Types of Current: 

                        Electric current can be either direct or alternating. Direct current (DC) flows in the same direction at all points in time, although the instantaneous magnitude of the current might vary. In an alternating current (AC), the flow of charge carriers reverses direction periodically.  

Potential difference (voltage):

                                            The electrical potential difference (Voltage) is defined as the amount of work done to carrying a unit charge from one point to another in an electric field. In other words, the potential difference is defined as the difference in the electric potential of the two charged bodies.

Unit of voltage: The voltage is represented by the symbol V, and their SI unit is volt. 

To understand the potential difference (Voltage); please click the link below https://www.youtube.com/watch?v=SNlOPxZ-Ev4 

Water Analogy: 

                 With a reference of below image, consider a Water tank as Voltage source which is having some potential energy. The water will flow from higher potential (tank) to Lower Potential (Ground), Then the Flow of water will be consider as Current. When the magnitude of the voltage is high, large current flow through the circuit and when their magnitude is low less current flow through it. 

To understand the Water Analogy; please click the link below 

https://www.youtube.com/watch?v=t5XWeQuEhU4