What is Energy?

The definition of work or energy is energy, energy that is derived from the Greek Energia, which is the ability to conduct business. Energy is eternal, meaning enegi can not be created and destroyed, but can be changed from one form to another form. Judging from the origin of energy has various forms such as: potential energy, kinetic energy, electrical energy, thermal energy, heat energy, and others.

Understanding Work (W)

To understand the work, consider the following events!
1. Pedal rickshaw pedicab drivers to carry passengers from one place to another. In this case the rickshaw drivers do work.
2. A horse was pulling a train that transports goods. In this event the horse do the work.
3. Vegetable sellers pushing his cart from one place to another. In this incident vegetable sellers to do business.
A force acting on the body said to be doing business if the force causes it to change places. The force does not produce meaningful changes do not work. Working mathematically formulated as follows:

W = F x S

definition:
W = Work (Joule)
F = Force (Newton)
S = Distance (Metres)

In cgs units:
Business unit or dyne.cm ERG
Work units dyne
Distance units centimeters

Unit Conversions:
1 N = 10 ^ 5 dynes
1 m = 10 ^ 2 cm
1 Joule = 1 Nm = 1 x 10 ^ 7 ERG

Kinetic Energy

Kinetic energy is the energy possessed object because its motion. So that kinetic energy is also called the energy of motion. Berputra bicycle wheels, plastic floating, children ran, all have kinetic energy. How much? Kinetic energy depends on its mass and speed of moving objects.

The greater the mass of moving body kinetic energy is also increasingly besar.Demikian also the faster the object moves, the greater the kinetic energy. Truck traveling at 50 m / s will have a kinetic energy much larger than the motor that drove the same speed. Mathematically formulated Kinetic Energy:

Ek = 1 / 2 x m x v ^ 2

definition:
Ek = kinetic energy (Joule)
m = mass of the object (kg)
v = velocity (m / s ^ 2)

Potential Energy

 is the energy possessed objects because of the influence of his position or his position. Eg bows and arrows drawn if it is then released pull the arrows were going to slide. This is due to bow spring has potential energy. Likewise, apart from the mango fruit stalk will fall, this is because the mango was a gravitational potential energy. The amount of gravitational potential energy of an object can be mathematically formulated as follows : 

Ep = m x g x h
Definition: Ep = potential energy (Joule). m = mass of the object (kg). g = acceleration due to gravity (N / Kg) h = Altitude (meters)

Energy Unit

In International units (SI) of the energy is expressed with units of Joules (J). One joule equals 1 Newton meter (1 J = 1 Nm). Another unit of energy is the ERG, calories, and kWh.
Here are some of the energy conversion unit to another unit of energy:
1 Joule = 1 x 10 ^ 7 ERG
1 joule = 0.24 calories

1 Joule = 4.2 Joules.

Law of Conservation of Energy

If we do a story about the light energy emitted by the lamp and the heat liberated by the connecting wires, whether everything will be destroyed in nature? Apparently not. The light emitted by the light energy converted to motion of molecules in the surrounding air and so on. So energy can not be destroyed but only changed its form. What about the electrical energy for powering the lamp? Was it created its own energy with the batteries. Of course not, so energy can not be created.
From some of the above description can be concluded that "Energy can not be created and destroyed" is called the Law of Conservation of Energy.

Forms of Energy

There are several forms of energy, among others: chemical energy, electrical energy, thermal energy, mechanical energy, light energy, energy of motion, sound energy, nuclear energy, spring energy.

Energy changes form.
A battery batteries if we link the poles with a wire kaan generate electrical energy. If we connect the wires to the incandescent bulbs will light the lamp. of the above activities can we uurutkan benuk change energy is chemical energy into electrical energy transformed into light energy.

Understanding Energy

Why after work, thinking and exercising gradually became hungry, thirsty and tired? What do you do if you are hungry and thirsty? with eating and drinking mean that you have replaced the power you have used.
In everyday life, power is often called energy. Jadai energy is the ability to do work.
  Energy is not only owned living beings, but also possessed by inanimate objects such as solar, wind, waterfalls, coal, petroleum, and others. Try to mention other examples?.
The water trapped behind the dam have the energy that can be used to rotate the paddle wheel. Wind also has energy, wind can play wind or pushed kincior sailboat. Damage caused by ocean waves, it also shows that the wave energy.