Every year we celebrate many festivals. But sometimes we do not know the stories and reasons behind it. Why these festivals are celebrated. This is the season of Holi so we will see why we celebrate it the reason behind and what must learn.

What is the story behind Holi why do we celebrate it?

This Festival got its name from 'Holika'. Hiranya Kashyap use to be king of demons and after long prolonged austerity(meditation) he was blessed with power by Lord Bhrama which was no one can kill him either at night or during the day, nor at home or outside, without any weapons. He became powerful as he uses to misuse his powers and tell others to worship him as he was booned by gods.

Then after a long time, he was blessed with a son named 'Prahlad'. Prahlad uses to worship Lord Vishnu and he had a huge belief in Vishnu. When others use to worship Hiranya Kashyap his own son use to worship Lord Vishnu, he got angry.

Hiranya also threatened his son to worship him. But his son refused it. He also executed many plans to kill his son but none worked, even Prahlad was placed in between the poisonous snakes but none affected him he still worshiped God Vishnu.

Holika sitting along with Prahlad on burning pyres

At last, his father Hirnaya thought of one more plan to kill his son Prahlad, he approached his demoness daughter named Holika and told her that you are going to sit on fire with her younger brother Prahlad, Holika sat on fire covering herself with a blanket so that Prahlad get burnt. But Prahlad had the blessings of Lord Vishnu. 

But Look at the beauty of Nature, the blanket came on Prahlad, and Holika got burnt to ashes and Prahlad was safe.

After that Lord Vishnu came in the evening between day and night and killed Hiranya Kashyap and ended the story.

This is the reason every year on this day people burn large pyres to symbolize the burning of the demoness Holika then after this Festival got its name  'Holika' and one more question arises.

Why do we play with colors on Holi?

The question you must be thinking that why do we play with colors on Holi and who started it.

It all started when Shri Krishna started playing Holi with colors in Vrindavan with his friends. Colors had significant importance because at that time colors were made using flowers and that is the reason they were skin-friendly. 

But for a few decades, these colors are made using chemicals that harm our skin.

Thus, after the Holika bonfire, Holi is celebrated with colors.

Things to be learned 

Many things can be learned from this festival of Holi but here are some of the qualities of things we must learn,

Suppose there is a bike which travels a long mile but there is one condition, it must have petrol in it. So from here, we got to know that the working medium required in a bike will be "Petrol". It implies that the bike will not start if there is no petrol in it.

So the system that works on fluid like oil is called Hydraulics.

Similarly, any system that works on pressurized air is called Pneumatics.

Introduction

In Hydraulics, Pressurized oil is the working medium and in Pneumatic Compressed air is the working medium.

Hydraulics came from the Greek word "Hydraulikos" which means water pipeline 

Pneumatics came from the Greek word "Pneomatiks" which means Air Pressure.

History

Hero of Alexandria was a Roman engineer and mathematician of the century(A.D) who had a big contribution to Hydraulics and Pneumatics.

He had written many theories like Maths Physics mechanics pneumatics. So we call him the father of Hydraulics and Pneumatics.

Construction

There are three stages to it 

Stage 1: Input stage  

[ In the input stage there are devices like push buttons]

Stage 2: Control and processing stage  

[In this stage specialized control valves are used like 5/2,3/2,4/2. So that the fluid (working medium) flow can be controlled]

[In this cylinders are used as an output]

All the 3 steps are the same for both systems, the difference is the input supply. In hydraulics working medium is oil whereas in the pneumatic working medium is air.

Difference

Applications

For Hydraulics:

 A portable power supply has become the lifeline of the modern technological world, especially the Lithium-ion Battery. Imagine a world where all cars are driven by Induction motors and not Internal combustion engines. Induction motors are far superior to IC engines in almost all engineering aspects, additionally being more robust and cheaper. 

Another huge disadvantage of IC engines is that they only produce usable torque in a narrow band of engine RPM. Considering all of these factors, induction motors are definitely the perfect choice for an automobile. 

What is the difference between an IC engine and an electric engine?

Why are Electric cars better?

How do Electric cars have a connection with Solid-State Batteries?

Arrangement of Batteries in series and parallel

Taking the example of the Tesla cell, it has a voltage between 3 - and 4.2. These cells are called solid-state batteries and they are having a structure like normal batteries.

Many such Tesla cells are connected in series and in a parallel fashion to form a model. 16 such models are connected in series to form a battery pack in a Tesla car. Thus it forms a big battery on which the Tesla car runs. To know more about Solid State Batteries[Click Here]

Who is working on SSB (Solid State Batteries)?

And many companies are working on it but to the overheating of batteries, they are lagging.

How do Electric Cars have an advantage?

We're told that electric cars are the future. Petrol and diesel cars will be banned in the UK by 2030, and many European and American countries are following suit. 

India also is in the race for electric cars and many automobile companies are on the verge to launch their models. Likewise, Tesla's electric car works on a total electric solid-state battery which is the showstopper in the automobile sector for its different approach to satisfying the need of people and care towards nature. 

To take human life more towards the future. Tesla always comes up with innovative ideas for electric vehicles. 

Conclusion

Compared to Internal combustion engine (ICE) vehicles electric cars are quieter have no exhaust emissions and have lower overall emissions. Many electric car companies want to launch their own electric cars but they are still advancing in their batteries. 

However, the constant power supply for an induction motor is the real barrier to achieving the induction motor to revolutionize the automation industry.

The market for electric vehicles will be more significant in India in the future than ever seen before.