ELECTRICALPORT

Best Courses in 2020 after COVID-19

2020-04-23T20:50:00.001+05:30

Now the whole world is going through a very bad condition because of coronavirus pandemic. The COVID-19 pandemic has effected educational systems worldwide, leading to near total closures of schools, colleges and universities.

Due to COVID-19 all industries, companies are off. All the IT employees are doing their jobs from home i.e Work from Home. Some top universities research have said we have to maintain social distancing for next two years, so according to me Work from Home will get promotion at least for next two years. but we can only do that tasks which is possible through only internet like self servicing, mobile banking, online teaching, online monitoring, online marketing, online consulting etc. That means most of the jobs will be through online, so the growth of that fields will be high in future. Then we have to choose that type of courses which are related to above mentioned fields that means related to online.

Courses like Web developing, Web designing, Artificial intelligence, Machine Learning, Data Analytics etc that means which is related to computer and internet will have more growth in future. In my view BCA courses will have best opportunities.

If you are thinking about Engineering then it is right choice. After all Engineering is one of the best course. You must go for engineering. But you have to choose your course by observing the current scenario of your country and what will be the growth possibility after 10 years.

According to me, if your aim is to do private job or business for better growth you must select Computer Science Engineering(CSE) or Information technology(IT). but if you wish to do job at government sectors then you have to choose core branches like Mechanical Engineering(ME), Electrical Engineering(EE), Civil Engineering(CE). In future what will be the opportunity for government job we don't know due to economy problem.

In my opinion after 10 years Computer science Engineering(CSE) will have higher growth comparing EE, ME, CE due to Corona Pandemic.

In this article I only give you suggestion but choice will be yours. You should choose that stream for which you have Passion. Whatever stream you choose you have to do hardwork for your better career.

In Medical Department all the courses which are related to medical sectors like Nursing, Pharmacy, Hospital Management, Para-medical, Hospital Management, Biotechnology will have more demand in future due to COVID-19. Here I am not talking about MBBS or Doctors because without Doctors the above mentioned departments have no value. but for any department you must have good knowledge.

Not only Allopathy but Homeopathy and Ayurvedic also will have good growth.

In general courses that means honours degree courses demand will be less comparing with engineering degree, medical.

World is changing. So you should be ready for the next changes and should be ready to take the opportunity first.

Thank you and Best wishes for your career.

After CORONA pandemic Which industries will have high demand in future?

2020-04-21T23:01:00.000+05:30

In china Coronavirus outbreak was first reported on December 2019. After that COVID-19 has spread to more than 110 countries so far. I am writing this article on 20th April 2020. Still the rate of infection is not reduced rather its increasing day by day. I don't know what will happen next. Like so many other countries India is also trying to get rid of this pandemic situation. Due to this COVID-19 The economic condition of whole world is badly affected. COVID-19 has the potential to trigger a global economic crisis.

Globally, The Coronavirus shock may be severe even compare to the great Financial crisis 2007-08. Like other countries India's GDP growth rate is also reduced. According to IMF(International Monetary Fund), in 2020 the GDP growth rate of India will be 1.9% where as China will have 1.2% , USA will have -5.9% and Italy will have -9.1%. That means a very few number of countries GDP growth will be in positive, maximum countries GDP growth rate will be in negative. After one year in 2021 The GDp growth rate of India will be 7.4 where as China will have 9.2 and USA will have 4.7.

Due to this pandemic situtation which fields or sectors or industries will be affected? And after sinking GDP growth will be increased, then what will be change in the world?

In this article i would try to discuss about in India which field or sectors are effected due to this Novel Coronavirus and what will be the changes in future ?

Coaching centres that means offline educational coaching centres are badly affected because India's most of the students are heavily dependent on coaching centres. That means Coaching centres are running in heavily losses.
As offline coaching centres as well as all schools and colleges are closed, so online coaching or E-learning session is now on highly demanded or highly benefited. Many universities research and many industries research says that we have to maintain social distance upto two years or untill the vaccines of COVID-19 is discoverd. That means for upcoming years E-learning or online coaching will have high demand.
As all are in home due to lockdown for COVID-19 ,so many peoples tendency to play mobile games or online games for timepass is increased. Online activities is increased. That means Gaming Industries is going to be a highly profitable industry in this situation. In future also it will be one of the highly demanded industry because people will be addicted.
Due to this COVID-19, IT sector's employees are doing their job from home that means the tradition of Work form Home is enhanced. and to do work form home, Internet is necessary. So the uses of Internet will be increased.
Data science like Artificial Intelligence(AI), Machine Learning(ML), Data Analytics(DA) will be highly demanded, that means uses of Data sciences will be increased.
Digital marketing will be highly demanded or you can say online marketing will be highly benefited.
In health sectors, Biotechnology will be more demanded industry in future.
Pharmaceutical industries will have good growth because other countries are requesting to India for medicine, thats why also India's GDP will be in positive.
Health services related industries that means who are providing health services in the hospital or in the nursing home, will be more benefited.
In future Ayurvedic industries, Homeopathic industries will have good growth and traditional way of treatment is increased.
Depression Management related subjects like psychology will be one of the highly demanded sectors among the educational sectors because Many people will be depressed , get frustrated due to increasing of unemployment or joblessness.
People's tendency to do a Health Insurance will be increased due to this Corona pandemic. So Health Insurance will may be almost common.

We wish this storm will be stopped very soon and the whole World gets around from this pandemic situatuion as soon as possible.

Magnetic Circuit

2020-04-20T08:38:00.000+05:30

A magnetic circuit is nothing but it is a device in which flux flows in a closed path like in a electrical circuit the current flows in a closed loop.
A magnetic circuit is made up of magnetic material having high permeability such as iron, steel etc.

Mean Core Length : -

The path taken by the flux has a total length lₑ, which is called Mean core Length.

Magnetic Flux :

A magnetic material generats a field around the material. Magnetic flux means the total number of line of forces of magnetic field passing through a closed surface that means it's a measurement of the total magnetic field that crossing a certain surface.

Magnetic flux is commonly denoted by Φ(phi)

Formula of magnetic flux , Φ=B.A

where B= Magnetic field or Magnetic flux density and A= Cross sectional area of the core.

SI unit of magnetic flux is Weber(Wb).

CGS unit of Magnetic flux is Maxwell.

Fundamental unit of magnetic flux is Volt-seconds.

Magnetic flux is generally measured by fluxmeter.

Magnetic Flux Density :

The flux or line of forces per unit area is termed as magnetic flux density.

Per unit area means per unit current per unit length on a wire

Magnetic flux density is denoted by B.

Formula of magnetic flux density, B=Φ/A

∴B= Φ/(il)

where l=length of the conductor, i= current flowing through the counductor.

SI unit- weber/m² or Tesla(T)

Magnetic Field Intensity :

The magnetic field intensity or magnetic field strength is defined by MMF per unit length of the magnetic circuit that means the MMF needed to create a certain flux density(B) within a particular material per unit length of that material.

Magnetic field intensity is denoted by H.

Formula of magnetic flux intensity, H=(Ni)/l

where N= number of turns in magnetizing coil, i= current through the coil, l=length of the coil.

Unit - AT/m

The magnetic field intensity is also known as magnetic field strength or magnetizing force.

N.B: By using Gauss law of magnetism ,induced flux Φ=∮B.dS

Magnetic flux density's direction is same as Area Vector.

and Area Vector is always perpendicular to Area.

So, Φ=B.A

Why should I choose Engineering?

2020-04-19T21:51:00.001+05:30

Engineering is a way of thinking like outside of the box. It's a way of using a model to portray science. Engineers are constantly changing the world with inventions and solutions tha affects everybody's life. Engineering is the field that solves the most impactful of our problems in the world.

Engineering is one of the best course all over world. Engineering makes you creative, innovative and challenging. Engineering teaches you how to accept the challenges and how do deal with the challenges. Engineering helps to increase people's quality of life. Once you find something in your domain that like you then Engineering will be to fun.

Engineering force you to understand the basics of things and then you can use like whatever is in your background or whatever it drives you to change the world to push out an idea or something that's relevant to who you are that can affect other people life. You have to choose one stream out of so many branches or streams in Engineering field in which field you have passion . At last I want to suggest you to go that field in which zone you feel comfort or you have passion to do something in that specific field but you have to give your best.

Basics of ELECTROMAGNETISM

2020-04-15T20:36:00.000+05:30

What is Electromagnetism?

Electromagnetism, the study about electromagnetic force is a branch of Physics which is the most important in Electrical Engineering.

Electrical Machines are build upon the principle of Electromagnetism, to transfer the electrical energy or to convert the energy from one form to another.

Electromagnetism means electrical field and magnetic field are interrelated. That means Electromagnetism has two part-i. Electrical field and ii.Magnetic field.

A time varying electrical field(dE/dt) can lead to induction of magnetic flux density(B) or magnetic field(H)
Similarly a time varying magnetic field can lead to an induced Electric field(E).

---It is Electromagnetism that means Electricity can be converted to magnetism or magnetism can be converted to electricity.

Such some laws which is related to electrical domain and magnetic domain, called Laws of Electromagnetism.

What is Electromagnetic Force ?

>> It's a force that acts between charged particles and is a combination of electrical and magnetic forces.

Suppose a charge '±q' is moving in a magnetic field with velocity 'V', then the charge experiences a force, called electromagnetic force.

∴ Electromagnetic force, F=±q(𝐕x𝐁) where 𝐁=Magnetic flux density

N.B. - 'q' must have sign.

Faraday's Law : -

Whenever there is time varying magnetic flux, then electromotive force(emf) is induced in the conductor or in the circuit which is proportional to rate of change of the flux linkage.

∴ EMF (E) = d⋋/dt ⋋ = Flux linkage

what is the difference between flux(∅) and flux linkage(⋋)?

>> Suppose we take a coil of 'N' number of turns and placed it in a magnetic field. Due to magnetic field there will be flux. The total flux may or may not be cut the coil . So how much of total flux is linking with the coil is called flux linkage(⋋).

∴ ⋋=N∅ where ∅=Total flux

Basic Requirements to satisfy Faraday's Law :-

i. Magnetic field (because need of flux)
ii. Set of Conductors ( so that emf can induced in the set of conductors)

N.B.- The set of conductors can be in the form of coil or in the form of simple conductors.

iii. Relative Variation - ( There must be relative variation between set of conductors and magnetic field , then only emf can induced as per faraday's rule.)

What is Relative Variation?

>> One quantity among the set of conductors and magnetic field , may be set of conductors or magnetic field is varied with the varying of time. There are two types of variation - i. Relative Time

variation and ii. Relative Space Variation.

Relative Time Variation : Magnetic flux density is varying with time that means Magnetic flux density(B) is a function of time.

∴B→B(t)

As, Φ =B(t)*A where A= Cross sectional Area

∴ Φ→Φ(t)

that means flux is also varying with time.

then, EMF(E) = dΦ(t)/dt

This type of induced emf is called Statically induced emf.

So, whenever there is a time varying flux, an emf will be induced in the coil that termed as Statically induced emf.

But the conductors must be stationary that means the system is stationary. This type of emf is induced in case of Transformer. That means in transformer the induced emf is static in nature.

Relative Space Variation : The position of conductors must be changing with respect to magnetic field.

This sort of variation results in Dynamically induced emf. (Example- Generators, Motors)

How does the electromagnetic force leads to induction of an emf in a conductors?

>> Lets consider for two types of induced emf.

Dynamically Induced EMF :

Suppose a conductor PQ or a coil PQ is moving with velocity 'V' in a magnetic field 'B' .
⛒➝ denotes inside the paper
if PQ has '+q' charge.

so , force, F=q(𝐕x𝐁)

So positive charge will experience a force in a particular direction.

To know the direction that means keep your finger in the direction of 𝐕 and curl them in the direction of 𝐁. Then the direction of thumb shows the direction of magnetic force which is upward. so positive charge will experience a force in the upward direction. Hence the positive charges will start collecting on the top of the conductor.

if PQ has '-q' charge. then F=-q(𝐕x𝐁).

Due to -ve sign the direction of force will be downwards. So the negative charges will start collecting in the bottom of the conductor.

So we have a conductor with positive(+) charges at the top and the negative(-) charges at the bottom, that means an electric field will be induced from positive to negative.

As Electric field is downward , the force on positive charge will be downward but the force on negative charge will be upward(opposite to the field).

But the magnetic field is trying to push the negative charge in downwards where as electric field is trying to push upward. So both the forces are opposite. At first there is net force on the negative charge or on the electrons. Electrons will keep moving but as soon as both the forces balance each other, then the net forces on the charge will be zero. The the charge will stop moving. So we are considering the steady state condition when the charge is not in motion and charge has stop accumulating at the both ends. That means

q𝐄=q(𝐕x𝐁) where q𝐄=Force in electric field

∴ 𝐄=(𝐕x𝐁) and q(𝐕x𝐁)= Force in magnetic field

𝐄=induced emf

∴ Potential Difference, PD = -∫𝐄.dl
=-∫(𝐕x𝐁).dl
As 𝐕 is rightward and 𝐁 is inward that means 𝐕 and𝐁 are perpendicular,
then PD = BLV
This 'PD' is termed as Dynamically Induced Emf. and it's also called as Motional Emf because Emf is induced by virtue of motion of the conductor inside a magnetic field.
This type of Emf is induced in rotating electrical machine.

Statically Induced Emf :

Statically Induced Emf means Emf is induced in the stationary conductors.
Lets take a coil whose flux(Φ) is a function of time.

∴ Φ = f(t)
=ΦₘCosωt
As Emf, EMF (E) = d⋋/dt where N=no of turns of Inductor
E = -NωΦₘ Sinωt and ⋋=flux linkage
E = -N*dΦ/dt
This -ve sign represents the Lenz's law.

Lenz's Law :-

Induced emf opposes the cause of induction , so that induction does not happen. Thats why we are showing -ve sign ⇒ E = -N*dΦ/dt
Example : In generator Emf(E) is induced due to Prime mover torque (Tₚₘ). Due to induced Emf(E), a current(I) will flow in the circuit. So This produced current(I) will oppose the cause of induction and the cause of Induction is Prime mover torque (Tₚₘ).
Now the question is How it oppose?
→The current(I) causes an additional torque (Tₑₘ) which is electromagnetic torque or induced torque. this induced toque will oppose the prime mover toque.

∴ T=Tₚₘ-Tₑₘ

Self Induced Emf :-

The Emf induced in the coil due to the change of flux produced by linking with its own turns.

Lets take a coil whose flux(Φ) is a function of time.

∴ Φ = f(t)
and ⋋=NΦ
E = -N*dΦ/dt
This is self induced emf, that means The coil itself is responsible for self induced Emf.
Self Inductance,L =Φ/i
Flux linkage, ⋋=(μ₀N²A)i/l where N= No of total turns on coil , l=length of the coil
∴ L= (μ₀N²A)/l and A= Cross-Sectional Area of the coil.

Mutually Induced Emf :-

When flux produced by one coil links to other coil and produces emf in the other coil, it is called Mutually induced Emf.
If the no of turns in coil1 is N₁ and in coil2 is N₂ ,
then Induced emf,E = -N₂dΦ(t)/dt
and Mutual Inductance, M = (μ₀N₁N₂A)/l