DEFINITION AND UNITS OF ENERGY

 DEFINITION AND UNITS OF ENERGY 

     the ability to work. It can exist in potential, kinetic, thermal, electrical, chemical, nuclear or other forms. 

     In addition, there is heat and  work, that is to say energy transferred from one body to another. 

     After its transfer, energy is always designated according to its nature.

     Consequently, the heat transferred can become thermal energy, while the work carried out can manifest itself in the form of mechanical energy.

     Vitality, in material science, the capacity to do work. It can exist in potential, motor, warm, electrical, concoction, atomic or different structures. 

     Likewise, there is warmth and work, in other words vitality being moved starting with one body then onto the next. 

     After its exchange, vitality is constantly assigned by its temperament. 

     Thus, the warmth moved can become warm vitality, while the work did can show itself as mechanical vitality.

     Vitality can nor be made nor wrecked, yet just changed starting with one structure then onto the next. 

     This standard is known as vitality preservation or the main law of thermodynamics. 

     For instance, when a crate slides down a slope, the potential vitality it has from its high situation on the slant is changed over into dynamic vitality, vitality of development. 

     As the container eases back to an erosion stop, the dynamic vitality of the crate development is changed over into warm vitality which warms the case and the slant.

     Vitality can be changed over starting with one structure then onto the next in various manners. 

     Usable mechanical or electrical vitality is, for instance, delivered by numerous sorts of gadgets, including inner ignition motors, generators, batteries, power devices and magnetohydrodynamic frameworks.

     In the International System of Units ( SI ), energy is measured in the joules. 

     One joule is equal to the work done by a force of a newton acting on a distance of one meter.

1.  BASIC UNITS OF ENERGY 

     The official unit of the International System (SI) is the Joule (1 J), equivalent to the work done by a power of 1 Newton whose purpose of use moves from 1 m to the power. 

     In all cases, this value is not important and is therefore very little used by and by.

     Really, calories have a long history of measuring amounts of heat.

     He talks about the amount of vitality needed to increase the temperature of 1 gram of water by 1 ° C to air pressure.

     Since this value fluctuates slightly depending on the underlying water temperature, there are contrasts between the definitions of occasion. 

     We hold the resulting equality: 

1 cal = 4.187 J (calories from the international steam table), a similar definition is used within the British imperial system.still widely used, 

     Especially in the United States: unity British hot or BTU indicates the amount of heat required to support a temperature of 1 lb (pound) of water (0.4535924 kg) by one degree Fahrenheit.


     With an identical show concerning calories, we have the consequent proportionality: 1 BTU = 1055.6 J This suggests: 1 BTU = 251.984 cal 

     The unit of intensity compared to the Joule work unit is that the Watt: a impact of 1 W used for 1 second discharges the vitality totaling 1 Joule.

     1 kilowatt hour (kWh) is the sum of vitality discharged for one hour by a 1 kW electric gadget.

     Kilowatt and kilowatt hours are units of intensity and vitality as often as possible to quantify power. 

By definition: 

1 Wh = 3600 J

 1 kWh = 3.6 10⁶  J  =  3.6 MJ.

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