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Energy

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We hear about energy when the thought of work comes to our mind. Can you do any work without energy? You just don't have any other option other than saying no, Work and energy are interrelated. Energy is a capacity given to a body to perform work. It is always conserved. Energy is of many forms like heat, light, electrical, sound etc. Energy may be a small concept but has lot more to discuss if dealt with consumption. The increasing need of energy has made it expensive and this trend will continue if one is not serious about consuming energy. 

Energy is the capacity of a physical system to perform work. Energy can be converted in various forms but not created or destroyed. The law of conservation of energy states that the total energy of a system can only change if energy is transferred into or out of the system. Everything we do is connected to energy in one form or another. It's easy to make energy conservation part of your daily existence to avoid a serious crisis in the coming decades. The change in energy of an object is due to the transformation and is equal to the work done on the object or by the object for the transformation.

What is Energy?

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Energy is defined as the ability to do work. Energy is the capacity of a physical system to perform work. Every action happening around us has energy behind it. Let’s check a few examples of energy from our daily life: A vehicle cannot run without fuel, here heat energy is converted into mechanical energy. When we eat, our bodies transform the energy stored in the food into energy to do work. When we run or walk, we "burn" food energy in our bodies. There are several other forms of energy like sound energy, radiant energy, chemical energy etc. 
Energy is that what makes a body to do work. Work is done if one form of energy is transformed into another. Conceptually it is defined as It is the ability or capacity of body to perform work. It is expressed in Joules (J). There are many forms of energy existing in nature like heat energy, light energy, sound energy, electrical energy, thermal energy, nuclear energy and many. But any form of energy are either of two types - kinetic or Potential.

Kinetic Energy

It is an energy which is in Motion. 
Ex: sound, machines, moving wind, moving water etc.
The Kinetic energy of a non- rotating object of mass ‘m’ traveling at a speed (velocity) ‘v ’ is
Kinetic Energy Formula


Potential Energy

It is an energy which is stored and measured by the amount of work done. 
Ex: book on a table, roller coaster, water wheel, oil in a container, water in an ocean etc. 
Potential energy is calculated where ‘m’ is the mass in kilograms, ‘g’ is the acceleration due to gravity and ‘h’ is the height in meters. 
Potential Energy Formula

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Sources of Energy

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Energy resources are rich sources of energies present in our earth. There are many sources of energies which can be classified as Renewable and Non-renewable sources.

Renewable Energy:


Renewable energy is defined as energy that comes from resources which are naturally filled on earth such as sunlight, wind, rain, tides, waves and geothermal heat. Renewable energy resources exist over wide geographical areas, which are intense in limited countries. Renewable energy is derived from natural processes that are replenished continuously.

Examples of Renewable Energy:

1) Hydro-power energy: from rivers, tides, oceans
2) Wind energy: wind turbines
3) Solar power: produce electricity, heat water
4) Geothermal energy: using the heat deep under the earth's crust

Non Renewable energy:


Non Renewable energy is a resource that does not renew itself sufficiently for economic extraction. A non-renewable resource is a natural resource that is used up faster than it can be made by nature which cannot be produced, grown or generated.

Examples of Renewable Energy:

1) Fossil fuels – natural gas, coal, petroleum, crude oil
2) Nuclear power 

Conservation of Energy

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We hear about conservation and energy often that energy can neither be created nor destroyed but can be transformed into other forms or transferred from one object to another. Energy conservation refers to reducing energy consumption through using less of an energy service.

It says that:
Energy before transformation = Energy after transformation

Energy Problems

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Below mentioned are few examples of Energy: