difference between voltage and current

keeping in the mind of students, many might have got the doubt that what is the difference between voltage and current. So, this video may give you a good idea about it.

 Here, I give a piddling definition of two electrical quantities.,

    The voltage between two points is equal to the work done per unit of charge against a static   electric field to move the test charge between two points and is measured in units of volts. In simple words, which pushes the electrons in the circuit.
    An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. Current also can be defined as the rate at which the electrons flow along the given cross section.

Electric Field Electric field is defined as the electric force per unit charge. The direction of the field is taken to be the direction of the force it would exert on a positive test charge. The electric field is radially outward from a positive charge and radially in toward a negative point charge. Click on any of the examples above for more detail.

Electric Field of Point Charge The electric field of a point charge can be obtained from Coulomb's law: The electric field is radially outward from the point charge in all directions. The circles represent spherical equipotential surfaces. The electric field from any number of point charges can be obtained from a vector sum of the individual fields. A positive number is taken to be an outward field; the field of a negative charge is toward it. This electric field expression can also be obtained by applying Gauss' law. Other electric field geometries Multiple point charges

Index Electric field concepts

Electric and Magnetic Constants In the equations describing electric and magnetic fields and their propagation, three constants are normally used. One is the speed of light c, and the other two are the electric permittivity of free space ε0 and themagnetic permeability of free space, μ0. The magnetic permeability of free space is taken to have the exact value See also relative permeability This contains the force unit N for Newton and the unit A is the Ampere, the unit of electric current.With the magnetic permeability established, the electric permittivity takes the value given by the relationship where the speed of light c is given by This gives a value of free space permittivity which in practice is often used in the form These expressions contain the units F for Farad, the unit of capacitance, and C for Coulomb, the unit of electric charge. In the presence of polarizable or magnetic media, the effective constants will have different values. In the case of a polarizable medium, called a dielectric, the comparison is stated as a relative permittivity or a dielectric constant. In the case of magnetic media, the relative permeability may be stated. Physical connections to permittivity and permeability

Index Electric field concepts

Physical Connections to Electric Permittivity and Magnetic Permeability Expressions for the electric and magnetic fields in free space contain the electric permittivity ε0 and magnetic permeability μ0 of free space. As indicated in the section on electric and magnetic constants, these two quantities are not independent but are related to "c", the speed of light and other electromagnetic waves. The electric permittivity is connected to theenergy stored in an electric field. It is involved in the expression for capacitance because it affects the amount of charge which must be placed on a capacitor to achieve a certain net electric field. In the presence of a polarizable medium, it takes more charge to achieve a given net electric field and the effect of the medium is often stated in terms of a relative permittivity. The magnetic permeability is connected to theenergy stored in a magnetic field. It is involved in the expression for inductance because in the presence of a magnetizable medium, a larger amount of energy will be stored in the magnetic field for a given current through the coil. The effect of the medium is often stated in terms of a relative permeability.

Index Electric field concepts

ELECTRONIC OCEAN: SCOPE OF ECE

ELECTRONIC OCEAN: SCOPE OF ECE:               First of all, what is an  Engineering??   Engineering  is the application of mathematics, empirical evidence and scientific...

SCOPE OF ECE

              First of all, what is an Engineering?? Engineering is the application of mathematics, empirical evidence and scientific, economic, social, and practical knowledge in order to invent, innovate, design, build, maintain,research, and improve structures, machines, tools, systems, components, materials and processes.  
           Who is an Engineer? An engineer is a practitioner of engineering, concerned with applying scientific knowledge and mathematics to develop solutions for technical, societal and commercial problems.while considering the limitations imposed by practicality, regulation, safety, and cost. The word engineer is derived from the Latin words ingenium which means cleverness.

The work of engineers forms the link between scientific discoveries and their subsequent applications to human needs and quality of life.

       ECE(electronic and communication engineering)  the combination of two major branches of engineering, Electronics and Communication, is one of the largest and fastest growing sectors of the present industry. Electronics engineering distinguishes itself from other technical trades by the constant redefinition of its sphere of influence.This branch of engineering help us to see, hear and communicate over vast distances,  peripherals and components. We work with equipments that use extremely small amounts of power.

     The role of the electronics engineer is pivotal in realms ranging from the toy industry to consumer electronics, from household articles to space/satellite communication.

       ECE is a ocean of 2  sectors which has stated above,we, first  go with electronics. Electronics has classified into two which are analogue electronics which means it has a different parameters that are varies with time to time and the other is digital which has only two states 1's and 0's. A series of these two quantities gives a  lots  of applications.

        If we just look into our daily activities from  morning when you woke up and till when we go to bed at night .we just make our things happen easily in our daily routine with help of electronics.  These days mobile phone became a part of life is nothing but an electronic gadget which has a users of 4.43bn worldwide. Usage of electronics till then yet stopped, the journey has given rise to a new technologies  such as smart cities, Robots, electronic delivery machines(drones) etc.

       now, we go with communication, just think how it would there is no mobile phone(not smartphone), we cannot communicate across the continents and like much more may stop. This is possible only by ECE where the students enjoy the subject with many applications. application in the sense not only on the world but it had gone a thousands of kilometers higher than earth which is nothing but an application of space research. And in the world, defence is much more important than attack. It is also an application of communication which is named as defence reasearch development. like this, mobile communication, wifi applications, telecommunications etc.

       like this,it find its application everywhere like education, industries, medical , defense, research and developments across the whole world.