What is energy?

About the different types of energy written whole books. Many scientists conduct different experiments in this field. For humanity this is one of the most topical topics. With the development of technology, we have become almost completely dependent on power supplies. Therefore, many are interested in what energy is, what it is and how it is used.

Different sciences give their definition of energy. So, in physics it is a scalar quantity (ie its value can be expressed in one number), which is a single measure of various forms of motion and interaction of matter. Depending on the source of energy, the definition may vary. There is also such a thing as bioenergetics. By it we mean the field that surrounds the person. If it is good, then the energy is positive, if the evil is negative.

But we will focus only on what energy is in physics. The first kind of energy that a person could get is fire. Using the friction of two sticks, it was possible to get a spark and to kindle dry branches. So people could get a source of heat. With the development of civilization, water mills came to the world . With the help of a wheel, they could do different work due to the energy of the river. In Europe, in the XI century, windmills were built .

In the modern world, there are other types of energy. With the development of technology, there was a great need for a power source. Therefore, scientists are constantly looking for new types of energy. Not all countries and regions can use hydropower stations and wind farms. In recent years many researchers have started talking about the preservation of the natural resources of our planet. For this, it is proposed to use alternative energy sources, for example, the Sun (with the help of special batteries). To date, there are two ways to implement it. So you can use it as a heat source or convert directly into an electric current through a battery. The problem is that while the energy of the Sun is an expensive pleasure (despite the experimental houses).

Nuclear power is more promising. It is obtained as a result of the decay of atomic nuclei. Most often, uranium-235 or plutonium is used for this purpose. This type is used in bombs, as well as at special stations that allow you to receive heat and electricity.

But disputes about the construction of nuclear power plants are still being carried out. After the accident in Chernobyl, it became clear that in the event of a disaster people fall into the zone of defeat. Radiation poisoning all living things in the neighborhood, and this effect persists for many years. Therefore, much attention is paid to the development of security systems. But, from the point of view of ecology, nuclear power plants are not so harmful. Dangerous emissions from them are not recorded.

So, what is energy? It is a source of heat, electricity and so on. Get it in different ways. Scientists from all over the world are increasingly raising the problem of the exhaustibility of natural resources: gas, oil, coal. Therefore, in the modern world, more attention is paid to the development of alternative sources of nutrition. What is the energy of water, wind or the Sun? This is something that can be used forever.