post by – CURIOUS CREATION blog – devilsangelsite.wordpress.com

Hello! As a person working in power transmission sector, I would like to share with you some of the basic things about power and it’s transmission. You can see my blog- devilsangelsite@wordpress.com


Power is the amount of energy transferred or converted per unit time. In electrical system, it is the amount of energy transmitted or consumed per unit time. 

The S.I. unit of power is Watts, i.e., joules per second. 

P (power) is mathematically expressed as, 
P= VI where
V= system voltage & I= current flowing through the system.


Power is generated at power generation centers by using resources such as coal, fuel, water, radioactive materials, renewable energy sources such as solar power, wind, tide etc.

Based on the source or raw material used for generation, power generation centers are classified into various categories such as: Thermal generation, hydro power generation, nuclear power generation, solar generation, wind energy generation, tidal energy generation etc. 

Most commonly used resources are thermal generation ( from coal) and hydro power generation (from water ). 

As bio fuel is limited and hydro power has its own limitations, so renewable energy sources are the need of the hour. So, solar power is in high demand now. 

But due to the high capital cost of initial investment and installation, it is not easy to setup solar generation centers and also the solar cells used for generation purpose has reached Maximum efficiency of 12-16% as of now. More research is being done to improve the cell efficiency to increase the power output.

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Power is generated at the generation centers at the Voltage level of upto 11KV due to insulation problem and considering the equipment size. 

Power is then transmitted at the level of 132KV-765KV by setting up transformers. This transmission of power is done at very high voltage to reduce the current flowing through the conductor which then reduces the conductor size and cost and transmission losses. 

Power transmission is done by power transmission sector which maintains the transportation of bulk amount of power to other transmission points and to distribution centers.


After transmission of power, it is then distributed to industrial and domestic consumers through power distribution sector.

Before distribution, the Voltage level is stepped down upto 33KV level by means of step down transformers.

The distribution sector transmit power to commercial consumers at 33KV level and domestic consumers at 0.4KV level.

0.4KV is the 3-phase power that we know today. The single phase to neutral voltage of 230V is used for domestic usage purpose.

So, overall this is the process of power generation, transmission and distribution in the power sector.
Thank you for reading the post.

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Post by – penserstudypoint.com

Galaxy, that have billions of stars and billions billions planets.
All these stars and planets held together by gravity and all are rotating even a galaxy can rotate.

Milky way galaxy:- We are living in Milky Way galaxy. All the stars that are visible in the sky are in milky way and our sun is a part of these stars.

There are billions of galaxies in the universe. Every Galaxy have different shape and size.
The shape of galaxies are like Spiral galaxy, elliptical galaxy, irregular galaxy.

Aur Galaxy, the Milky Way is a spiral galaxy.

Visible galaxies from earth:- Through billion of galaxies, only three galaxies can be seen from earth. One of them is andromeda galaxy, which is 2.2 million light year away and it is the nearest galaxy to us.

According to scientists, clumps of dust and gases joined together to form stars planets and then a galaxy. That’s why most of the stars and planets are made of gases.

The Milky Way is a huge Whirlpool shape galaxy have billions of stars, dust and gases. Even light can take 100000 years to cross it from one end to another.

Some scientists thinks that there is a super massive black hole in the centre of our galaxy and the revolutions of that black hole are not so fast. That’s why milky way is stable.

Our solar system that have Sun, planets, etc. is only a tiny part of Milky Way galaxy and the milky way is a tiny part of the universe.

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Understanding the concept of LIGHT SOUND


Anything we hear around us is not is sound but vibration of particles. Vibration is a type of disturbance which propagates by particles of medium.

Sound is not travel but it is a wave that is transferred by particles in the form of vibrations (particles can only transfer the vibrations by one particle to second and 2nd to 3rd and so on by remain their positions).

Without particles, sound has no existence. Sound not travel in space because there are no particles in space. , so we transfer the information in form of signal in space.

Speed of sound in different mediums

Air – 343m/sec

Water – 1437m/sec

Glass – 4540m/sec

Iron – 5120m/sec

According to this, as the medium density increases sound speed also increases.

Effect of temperature- As temperature increases speed of sound increases.

The normal range of sound to hear anything for human is 20hz to 20000hz.

But minimum range of sound which a human can hear is 12hz and maximum is 28000hz.

The sound created by a volcano eruption in 1883 is in range of 180decibel and it can be heard up to 3000 miles (ca. 4,828 km).

the sound created by the explosion of nuclear bomb is in range of 240 to 280+ decibels.

So, we cannot imagine what will be the loudest sound.


Light energy is a traveling Photon which is a form of electromagnetic radiation. Photon is a bundle of energy. 

Speed of light is 3 × 10⁸m/sec. in vacuum. 

As dense as the medium the speed of light will decrease.

Nature of light-

Light has dual nature

1- wave nature- we consider the light have wave nature because light has the property of diffraction, refraction, and interference etc.

2-particle nature- light has particle nature because it emits electrons when it strikes on metal surface called Photoelectric effect.

mass of photon is zero.

Formation of light energy -when we provide heat to an object it is start to emit photons.

The number of emitting photons, depending on temperature of the object. 

Photon having a special property that they can never exist in stable form. They start to travel since their formation.

Intensity of light inversely proportional to square of source distance.

7 properties of light – 

reflection, diffraction ,refraction ,polarization, interference ,dispersion, scattering.

Visible light is made up of seven colors known as VIBGYOR.

V – Violet 

I – Indigo

B – blue

G – green 

Y – yellow 

O – orange 

R – red

Where red light has the longest wavelength while violet light has the shortest wavelength.


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