Entire books have been written about different types of energy. Many scientists conduct various experiments in this area. For humanity, this is one of the most pressing topics. With the development of technology, we have become almost completely dependent on power sources. 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, this is a scalar quantity (i.e. its value can be expressed as a single 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 such a thing as bioenergy. By it is meant the field that surrounds a person. If it is good, then the energy is positive, if evil is negative.
But we will focus only on what energy is in the framework of physics. The first type 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 were able to get a source of heat. With the development of civilization, water mills came into the world . With the help of a wheel, they could perform different work due to the energy of the river. In Europe, windmills were built in the 11th century .
Other types of energy have appeared in the modern world . With the development of technology, there is a great need for a power source. Therefore, scientists are constantly looking for new forms of energy. Not all countries and regions can use hydropower and wind farms. In recent years, many researchers have started talking about the conservation of the natural resources of our planet. For this, it is proposed to use alternative energy sources, for example, the Sun (using special batteries). Today there are two ways to implement it. So you can use it as a heat source or convert directly into electric current through a battery. The problem is that while the energy of the Sun is an expensive pleasure (despite experimental houses).
Atomic energy 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 in special stations that allow you to receive heat and electricity.
But disputes over the construction of nuclear plants are still ongoing. After the Chernobyl accident, it became clear that in the event of a disaster, people would fall into the affected area. Radiation poisons all life in the area, and this effect persists for many years. Therefore, much attention is paid to the development of security systems. But, from an environmental point of view, nuclear plants are not so harmful. Hazardous 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 around the world are increasingly raising the problem of the exhaustibility of natural resources: gas, oil, coal. Therefore, in the modern world, more and more attention is paid to the development of alternative food sources. What is the energy of water, wind or the sun? This is something that can be used forever.