CLASSIFICATION OF ENERGY AND CONSERVATION OF ENERGY
All forms of energy are divided into two unique classifications, which deal with either motion or position. Energy of motion is commonly called kinetic energy. Potential energy is used to describe energy of position or molecular arrangement.
A body containing potential energy is primarily due to its position condition or chemical state. A rock sitting at the top of hill, or the weight on a cuckoo clock represents potential energy of position. Both are higher than their surroundings. A wound clock spring posses potential energy because it can supply the work necessary to make a clock operate for many hours. The potential energy of gas or fuel oil is used to heat a building. Burning a gas causes chemical energy to be released as heat energy.
Kinetic energy is based upon the movement of a particular body. Very body placed in motion does work and continues to do work until it reaches zero velocity. If an elastic band is stretched between two fingers, it represents potential energy. Releasing the band causes it to snap back to its normal position. Potential energy is changed immediately to kinetic energy as long as the bank is in motion. The work "kinetic" comes form a Greek work "Kineme" which means motion. This energy can be found in wind, water falling over a dam, an automobile rolling downhill, a moving motor shaft and electron flow in a conductor.
Potential and kinetic energy are also related to the form in which energy is found. The forms of energy includes:
- Light Energy
- Heat or Thermal Energy
- Mechanical Energy
- Chemical Energy
CONSERVATION OF ENERGY
If a given amount of energy is followed through various changes, we find that its total energy does not essentially change. The law of conservation of energy states that the amount of energy in the universe is always the same. It is possible to get only as much energy out of machine as you pout into it. In practice, output energy in a usable form is always somewhat less than the input. A portion of useful energy is usually wasted as heat in overcoming friction. In effect, energy can neither be created nor destroyed but can only ge changed into another form.
In fact when emery of one form disappear, other forms of energy appear in equal amount The operational equipment of a building is directly related to this law. is effect, we are very concerned with operation being achieved with a minimum of energy loss. Efficient equipment operation with reduced energy losses will help to keep the word's supply of useful energy in proper balance.