So let's start with...
WHAT is Energy ??
In physics, Energy is characterized as the capacity to do work.
Energy works upon the principle of '1st Law of Thermodynamics'.
S.I Unit : joules ( J )
CGS Unit : erg
WHAT does 1st Law of Thermodynamics state ??
The 1st Law of thermodynamics is the application of the conservation of energy.
It states that Energy can neither be created nor be destroyed, it can just be transformed from one form to another.
The Total Energy of the system remains constant by just changing it's form to another.
Eg:
When we turn on the Halogen bulb we think that the Electrical energy is completely utilized by the bulb. But it isn't so. In actual the Electrical Energy in converted Light Energy and Heat Energy. This can be proved as when you turn ON the switch the bulb glows up and provides us light. After few minutes we can feel that the room where the bulb is turned ON has started to feel warmer than earlier.
When you are driving a car the Chemical Energy of Petrol is being used utilized by the Engine to convert it from Chemical Energy into Mechanical Energy which enables the car to move. In this process the Chemical Energy is not completely converted into Mechanical Energy but also in form in Heat Energy that make the Engine hot which turn leads to heating of Bonnet.
WHAT are the types of Energy ??
Electrical Energy
Thermal/Heat Energy
Chemical Energy
Magnetic Energy
Sound Energy
Solar Energy, etc.
WHAT is Electrical Energy and it's Significance ??
Electrical energy is the energy derived from electric potential energy or kinetic energy of the charged particles
The amount of energy depends on the speed of the charges, the faster they move, the more electrical energy they carry.
Electricity & Electric Energy are two different terms.
Electricity is quantity that is derived from Electric Energy.
S.I Unit : joule (J)- watt/sec
Even though the S.I unit of electric energy is joules (J), but commercially it is still measured in kilowatt-hour (kWh).
(kWh) is generally is used when to describe the units consumed in our electricity bills.
(eV) Electron volt is also used in some fields as a unit to measure Electric Energy.
Well let's see the Significance of Electric energy in our daily life.
All the home appliance such as Fan, lights, TV, Air conditioner, Mixer grinders, Geysers, etc. all work on Electricity which is nothing but Electric Energy.
At offices we use laptops, printers, PCs, lights, Air Conditioners, etc. also work on Electrical Energy.
Street lights, car batteries, portable batteries, mobile phone all work due to supply of Electric Energy.
There are many applications of Electric Energy in our day to day life. It's like even if you are at any part of Earth you will be having Electric Energy in within our 500metres range. It has now became the 4th basic necessity of Human beings apart than food, clothing and shelter. And if you look closely you will be realize that our 3 basic necessities are also dependent on Electric Energy. No Electric Energy no Textile Mills, No Food industry.
Now just imagine a day without Electric Energy....
Dreadful right😨 ???
Yes, it might result into huge Economic losses as well as disrupt livelihood of humans.
WHAT is Thermal Energy and it's Significance ??
Thermal energy / heat energy is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.
Basically it's the energy that comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature.
The molecules and atoms that make up matter are moving all the time.
When a material heats up, the increase in temperature causes these particles to travel quickly and collide with one another.
Thermal energy is the energy emitted by a hot object.
The hotter the substance, the more its particles move, and the higher its thermal energy.
Well let's see the Significance of Thermal energy in our daily life.
Ever had hot chocolate 😋?? No no the hot chocolate isn't the significance. But every time you have any food served hot that's because of Thermal Energy. Yes, every time you cook food on stove it's possible all because of Thermal Energy. The cooking gas produces flame that heats up the vessel and in turn the material/food placed in the vessel gets cooked/hot.
Heaters used in winters are also based on this principle of Thermal energy. Heater makes use of Electric Energy and converts it into Thermal Energy which makes the surrounding warmer. Not just heaters but also bonfire work on the principle of Thermal Energy.
There are many such examples of Thermal Energy which can tell us about it's significance.
Now you just imagine if Thermal Energy ceases one day !!!!
WHAT is Chemical Energy and it's Significance ??
Chemical energy is stored in the bonds that link atoms to atoms and molecules to molecules.
Basically it's the energy that is stored in bonds of chemical compounds.
Chemical energy is a kind of potential energy since it is stored in the bonds.
It is released whenever a chemical reaction takes place.
Such reactions are mostly exothermic in nature where the by-product is Heat in most of the cases.
Well let's see the Significance of Chemical energy in our daily life.
All the food items that we eat contains Chemical Energy. When we eat our food the Chemical energy contained by it gets released into our body and is converted into Mechanical Energy that enables us to do work and feel energized. The molecules in food breakdown into small pieces. When the bonds between these atoms break, a chemical reaction takes place, and new compounds are formed and as the bonds break, the oxidation takes place instantly.
Plants use solar energy for photosynthesis process whose by products are Oxygen and Carbohydrates. In this the it's the solar energy that initiates the reaction inside the plants chemically and the Oxygen is released as a by-product.
When you are driving a car the Chemical Energy of Petrol is being used utilized by the Engine to convert it from Chemical Energy into Mechanical Energy which enables the car to move. In this process the Chemical Energy is not completely converted into Mechanical Energy but also in form in Heat Energy that make the Engine hot which turn leads to heating of Bonnet. As you can see below the fuel that is getting combusted inside the Cylinder/engine is pushing the Pistons downward which are connected to crank shaft. The down movement of piston induces rotary motion in crank shaft, This movement of crank shaft not only transmits rotary movement to axle but also to the Cam shaft which are responsible for proper working of valves through timing belt.
WHAT is Magnetic Energy and it's Significance ??
Magnetism is defined by magnetic fields.
Magnetic materials (for eg: permanent magnets), electromagnetic currents (for eg: current carrying coils), or a transient alteration in the electric field induce magnetism.
The amount of magnetic energy varies depending on the material.
Higher the magnetic energy, greater the magnetic forces.
let's see the Significance of Magnetic energy in our daily life.
The most basic application of Magnetic force can be seen in Refrigerator doors. Well everyone of you must be aware of magnets that are placed inside the door of Refrigerator which keeps it closed properly and insulated from outside atmosphere. The weak ferromagnetic ceramics like barium ferrite or strontium ferrite present in the fridge magnet aligns the spins of unpaired electrons in metal atoms in the fridge in such a way that the magnet and the fridge door are attracted to each other; this force keeping the doors closed.
Ever asked to get a MRI done from doctor ?? Hope no one has to under go this. But, yes the MRI machines work on the principle of magnetism which is derivative of Magnetic Energy. These MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body.
Most importantly the Electric Motors that are used in Industries as well as in other application are based on this.
Data is contained in hard disc drives by the use of magnetism. The disc is coated in magnetic material, which is made up of billions, if not trillions, of tiny magnets. Data is contained in the disc using an electromagnetic head.
Also the famous MAGLEV trains work the principle of magnetism which is a derivative of Magnetic Energy.
The absence of Magnetic Force can even cost a life sometime. And also the crucial part of modernization DATA won't be able to get stored.
WHAT is Sound Energy and it's Significance ??
Sound energy is the movement of energy through a substance in waves.
When a force induces an entity or material to vibrate, sound energy is emitted.
The energy is then transmitted into the material in the form of waves known as sound waves.
Unlike light energy, sound cannot travel through a vacuum, because there are no atoms to transmit the vibration.
let's see the Significance of Sound energy in our daily life.
Ever got scolded by mom because you weren't able to hear properly what she said ?? Scary incident😨. Yes this would happen everyday, every moment if Sound energy wouldn't have been there, but yes then even your mom won't be able to scold you for same due to absence of Sound Energy🤣.
Jokes apart, Sound Energy is the one that enables us to hear what other person is trying to say us. When a person speaks sound waves are generated in the air which reaches into the other person's ears and thus that person is able to hear what is being said to him.
SONAR system that used to measure the depth of water body in cases of Ships is based on this principle.
There are many examples/applications of Sound Energy which has made our lives easier.
WHAT is Solar Energy and it's Significance ??
Solar energy is the most abundant energy resource on Earth.
The sun does more than only provide light during the day for our world; each molecule of sunlight (called a photon) that enters Earth provides energy that powers our planet.
Photovoltaics and solar thermal collectors can be used to absorb solar power and transform it to usable energy.
Solar Energy can be converted into either Electric Energy and Thermal Energy.
Significance of Solar Energy:
Solar energy is used by plants during photosynthesis process which serves them with energy/food. Plants are dependent on Sun for their daily nutrition requirement along with water. Plants are the ones who gives us oxygen imagine if plants start to die due to absence/lack of Solar Energy this would also effect the living population.
Solar Energy can be used to produce Electric Energy without releasing any harmful pollutants into the nature. In the world where population is rising day by day it's best the turn towards Solar Energy to meet/satisfy our Electric Energy requirements.
Satellites use solar cells to convert sunlight into electrical energy, powering sophisticated on-board radio and computer equipment and affecting your daily life through satellite radio, television and weather forecasting.
So we can conclude that, Energy is most crucial requirement for our existence. We use different forms of energy throughout our life in different ways unknowingly. We breathe that's possible because of an energy, we eat food and nourish our body that possible due to energy stored in food, transportation utilizes energy, watching television for entertainment that because of electrical energy, use mobile phones that are charged using electrical energy, & what not.... The list just keeps on going and going.
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