# The energy utilized by an object

Energy is most used everywhere where there is work. Because for making any activities the energy is converted into work.  In the energy rate, it used to calculate the plans and Reliant Energy Reviews also taken according to the development. Specifically, in the mechanical field, the energy is expressed in terms of power like thermal power, mechanical power, electrical power, etc.. Now by looking on the mechanical field the car uses fuel for moving, here the energy input is measured as the fuel consuming time and the output is measured by how fast the engine converts the fuel through burning it and making the motion of the car. The rate at which the fuel is used by an engine is known as thermal power. Most of the energy is considered in a thermal power plant where the energies are created through any of the sources for later use. Here Second law of thermodynamics is used where there is no machine completely converts energy into work. This is also called a Kelvin-plack statement. Carnot engine and Carnot efficiency

On this engine, there is reversible interaction on mechanical and thermal power. This shows that the machine makes a motion and comes back to its original state without an increase in entropy. This can be possible only when the machine is in thermal equilibrium. During friction, there is no energy loss, so there is no heat transfer and this is said to be an adiabatic process. These are all in a mechanical interaction and on seeing in thermal interactions heat transfer is infinitely low, this is because the temperature difference between the system and the input-output heat is nearly the same, which makes to transfer the heat on infinite time. These all can be happened by keeping the initial temperature constant and this is called an isothermal process.  An engine that follows these all, then it is said to be a Carnot engine. Now the Carnot efficiency determining the thermal efficiency that a heat engine can achieve as the second law of thermodynamics. This law was derived by sadi Carnot in 1824. He makes the idea of maximum efficiency in a heat engine by the question of whether or not the Efficiency of a heat engine can approach 100 percent or is there an upper limit that can be exceeded. The answer shows there is a Maximum value so he developed an ideal engine that gives theoretical efficiency. And that efficiency is called Carnot efficiency and this engine is termed as cannot engine.

Energy expressed on work

The mechanical motion of an object is said to be a work. Since work is a movement of energy. This is measured by Joules(J). Work is done when an object tends to move by a physical force in some distance. This process makes some changes in the objects’ position which results in kinetic energy. Sometimes energy can create on an object by natural aspects like temperature. By affecting the internal energy of an object the energy is produced. By having physical sense the energy is created due to the impact of one object on another. For example, throwing a Javelin is by giving force to the javelin through the arms on the hand with some distance. Here the hand is doing some work on the javelin which produces the kinetic energy, this gives the speed for an object.