Definition of Energy
Energy is the ability to do work. Energy is a derived quantity with units of Nm or Joule. Energy and work have the same units. Energy is defined as the power or force to do something, which is generally defined as the ability to do a job. Work is defined as an attempt to move an object by a distance S (m) with a force F (Newton).
With the energy of all things can happen. The sun shines is the energy that makes plants can live and thrive, the energy contained in food can make us move and maintain the body temperature to keep warm, and energy in the fuel the engine
.
A. Forms of Energy
Energy comes in many forms and can be converted to another form. Now we will discuss forms of energy: potential energy, kinetic energy, mechanical energy, thermal energy, solar energy, and chemical energy.
1. Potential Energy
Potential energy is energy stored in the object because of its location. Example, potential energy of spring is the energy possessed by objects connected by a spring to be at a certain position because of the pull of a spring, shown by the equation Ep = ½ KX2. The potential energy of water is the energy cause possessed height of surface water, as shown by the equation Ep = mgh.
2. Kinetic energy
energy of an object as it moves with velocity V, for example,
Moving vehicles, falling objects etc. are shown by the equation Ek = ½ mV2
3. Mechanical energy
Mechanical energy is energy that is the sum of potential energy and kinetic energy. Mathematically shown in equation Em = Ep + Ek. As for energy or mechanical work on the engine, is the work resulting from the expansion or work required of compression process. Mechanical work (dW) is proportional to the volume change (dV) at a sprcific pressure (p) and are identified by the equation ΔW = p.ΔV. as an example of this energy is simply the movement of the piston, crankshaft rotation, and others.
Mechanical energy in the rotating objects such as shaft fluid machines (turbines, pumps, or compressors) is call Torque (T) is the energy required or generated to rotate the object by the centrifugal force (F) where the energy is at a radius (r) particular from the center of rotation and is shown by the equation T = Fr
4. Thermal energy
Thermal energy is the energy form the basis on which all the energy can be converted in full into heat energy. Stored energy can be latent heat or sensible heat in the form of enthalpy.
5. Solar Energy
Solar energy is energy obtained by converting the sun's heat energy through certain equipment to be a resource in another form. The sun on basically is a giant fusion reactor that converts part of the mass of hydrogen into heat energy and radiation. This is expressed by the equation E = mc2. Where m is the mass converted (kg) and c is the speed of light in vacuum (3 x 108 m/s), while E is the energy liberated.
6.Chemical Energy
Chemical energy is energy that comes out as a result of electron interaction in which two or more atoms / molecules combine to produce a stable chemical compound. Is a form of stored energy. Chemical energy contained in the endotherm reaction and the exotherm reaction. Exothermic reaction is that if a reaction produces heat, usually called combustion reactions involving the oxidation of fuels. While the endothermic reaction is when the chemical reaction that absorbs energy.
B. Properties of Energy
1.Transform energy, energy can be converted in another form. Examples of heat energy into mechanical energy combustion engine.
2.Transfer energy, thermal energy from a material or can be delivered somewhere or other material. Examples of heating water in the pan, with heat energy is transferred through the fire originated in the pan so that the material heats the water and after going through boiling water, then water will evaporate.
3.Energy can be moved, from another object by a force which causes the shift. In this case often referred to as mechanical energy.
Energy is the ability to do work. Energy is a derived quantity with units of Nm or Joule. Energy and work have the same units. Energy is defined as the power or force to do something, which is generally defined as the ability to do a job. Work is defined as an attempt to move an object by a distance S (m) with a force F (Newton).
With the energy of all things can happen. The sun shines is the energy that makes plants can live and thrive, the energy contained in food can make us move and maintain the body temperature to keep warm, and energy in the fuel the engine
.
A. Forms of Energy
Energy comes in many forms and can be converted to another form. Now we will discuss forms of energy: potential energy, kinetic energy, mechanical energy, thermal energy, solar energy, and chemical energy.
1. Potential Energy
Potential energy is energy stored in the object because of its location. Example, potential energy of spring is the energy possessed by objects connected by a spring to be at a certain position because of the pull of a spring, shown by the equation Ep = ½ KX2. The potential energy of water is the energy cause possessed height of surface water, as shown by the equation Ep = mgh.
2. Kinetic energy
energy of an object as it moves with velocity V, for example,
Moving vehicles, falling objects etc. are shown by the equation Ek = ½ mV2
3. Mechanical energy
Mechanical energy is energy that is the sum of potential energy and kinetic energy. Mathematically shown in equation Em = Ep + Ek. As for energy or mechanical work on the engine, is the work resulting from the expansion or work required of compression process. Mechanical work (dW) is proportional to the volume change (dV) at a sprcific pressure (p) and are identified by the equation ΔW = p.ΔV. as an example of this energy is simply the movement of the piston, crankshaft rotation, and others.
Mechanical energy in the rotating objects such as shaft fluid machines (turbines, pumps, or compressors) is call Torque (T) is the energy required or generated to rotate the object by the centrifugal force (F) where the energy is at a radius (r) particular from the center of rotation and is shown by the equation T = Fr
4. Thermal energy
Thermal energy is the energy form the basis on which all the energy can be converted in full into heat energy. Stored energy can be latent heat or sensible heat in the form of enthalpy.
5. Solar Energy
Solar energy is energy obtained by converting the sun's heat energy through certain equipment to be a resource in another form. The sun on basically is a giant fusion reactor that converts part of the mass of hydrogen into heat energy and radiation. This is expressed by the equation E = mc2. Where m is the mass converted (kg) and c is the speed of light in vacuum (3 x 108 m/s), while E is the energy liberated.
6.Chemical Energy
Chemical energy is energy that comes out as a result of electron interaction in which two or more atoms / molecules combine to produce a stable chemical compound. Is a form of stored energy. Chemical energy contained in the endotherm reaction and the exotherm reaction. Exothermic reaction is that if a reaction produces heat, usually called combustion reactions involving the oxidation of fuels. While the endothermic reaction is when the chemical reaction that absorbs energy.
B. Properties of Energy
1.Transform energy, energy can be converted in another form. Examples of heat energy into mechanical energy combustion engine.
2.Transfer energy, thermal energy from a material or can be delivered somewhere or other material. Examples of heating water in the pan, with heat energy is transferred through the fire originated in the pan so that the material heats the water and after going through boiling water, then water will evaporate.
3.Energy can be moved, from another object by a force which causes the shift. In this case often referred to as mechanical energy.
4.Energy is conserved, energy can not be created and destroyed.
C. Sources of Energy
Energy sources are grouped into two types, namely: 1. Renewable energy, an energy source that can be easily filled or formed again and 2. Nonrenewable energy, a usual source of energy that we use and have not formed again or take millions of knowledge to form again.
Renewable Energy
These energy sources include solar energy, wind, geothermal energy, biomass from plants, hydropower, and several other types of energy are still under development.
Nonrenewable Energy
We get most energy from energy sources that can not renewable, which includes this source of fuel oil, natural gas and coal. They are called fossil fuels, because the source is formed over millions of years by the action of heat from the earth's core and pressure from rocks and soil residual (or fossil) from dead plants and microscopic living creatures. Other forms of energy sources that can not renewable is the uranium, which the atom will be split (through a process called nuclear fission) to create heat and ultimately into electricity.
Renewable Energy
These energy sources include solar energy, wind, geothermal energy, biomass from plants, hydropower, and several other types of energy are still under development.
Nonrenewable Energy
We get most energy from energy sources that can not renewable, which includes this source of fuel oil, natural gas and coal. They are called fossil fuels, because the source is formed over millions of years by the action of heat from the earth's core and pressure from rocks and soil residual (or fossil) from dead plants and microscopic living creatures. Other forms of energy sources that can not renewable is the uranium, which the atom will be split (through a process called nuclear fission) to create heat and ultimately into electricity.
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