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  Drift Velocity What is Drift Velocity? Subatomic particles like electrons move in random directions all the time. When electrons are subjected to an electric field they do move randomly, but they slowly drift in one direction, in the direction of the  electric field  applied. The net velocity at which these electrons drift is known as  drift velocity . Drift velocity can be defined as: The average velocity attained by charged particles, (eg. electrons) in a material due to an electric field. The SI unit of drift velocity is m/s. It is also measured in m 2 /(V.s). Average drift velocity and the direction of the electric field Net velocity of the electrons: Every material above absolute zero temperature which can conduct like metals will have some free electrons moving at random velocity. When a potential is applied around a conductor the electrons will tend to move towards the positive potential, but as they move, they will collide with atoms and will bounce ba...

  Current Density Current Definition: We can define current as the flow of electrically charged particles, mostly in those atoms which are electron-deficient. The standard symbol of current is capital  I . The standard unit of current is ampere and it is denoted by  A . Conversely, a current of one ampere is one coulomb of charge(6.24 x 10 18  charge carriers) going past a given point per second. According to Physicists, Current is considered to move from relatively positive to negative points, and this is known as conventional current. Electrons are known to be the common negatively-charged carriers and circulate from relatively negative to positive points. In this article, we will learn about the concepts of Current Density in a detailed manner. Types of Current The current can be divided into two types. Direct Current: Direct current travels towards the same direction at all points, although the instantaneous magnitude can differ. An example of...

  Self-Inductance and Inductive Reactance After reading this section you will be able to do the following: Describe what self-inductance is. Understand what an  inductor  is and how it appears in circuits.  The property of  self-inductance  is a particular form of  electromagnetic induction . Self  inductance  is defined as the induction of a  voltage  in a current-carrying wire when the  current  in the wire itself is changing. In the case of self-inductance, the  magnetic field  created by a changing  current  in the  circuit  itself induces a  voltage  in the same  circuit . Therefore, the  voltage  is self-induced. The term  inductor  is used to describe a  circuit  element possessing the property of  inductance  and a  coil  of wire is a very common  inductor . In  circuit diagrams , a  coil  or wire is u...