Let's see what is measured in joules

Physics is the science of the natural direction. Probably, that's why she is given a lot of attention in the school course. Often pupils are faced with the question of what is measured in joules. This is quite expected, since different sections of physics can include this value. However, if you try to sort out a little about the topic, then everything will immediately fall into place. Where can you find what is measured in joules? The answer is not simple, but understandable.

Everything starts with a simple formula A = F * S. On such a dependency, the control work can get caught after the first month of getting acquainted with physics. If you immediately understand what's what, you can start a completely successful acquaintance with science. F is the sum of all the acting forces applied to the body, which affected the change in the position of the body. It is measured in Newtons. The judgment that strength is measured in joules is wrong. S is the path that the body passed. In SI units it is indicated by meters. Thus, 1 J = 1 H * 1 m. That is, in fact, we found work from a physical point of view. And it does not matter who and under what circumstances it was committed.

Further, as a rule, thermal processes are studied in the eighth class. Many new concepts are introduced here. The basic formula is Q = cm (t1-t2). Here again the question arises about what is measured in joules in a given relationship. And, by the way, we note that there was some kind of incomprehensible variable c. In fact, this is the specific heat of the substance. It is worth noting that this is usually a constant value, measured long ago. Its dimension is J / (Kg * Degrees Celsius). From this it is easy to see that it is worth multiplying this value by mass and by some temperature, then joules are obtained. That is the letter Q. It is something measured in them. It is worth saying that in fact, heat is energy. For example, in internal combustion engines, Q is first allocated, which then transforms to A = F * S with some efficiency. This, in principle, can be based on some Olympiad problems for grade 7-8.

Another big section that should be considered in order to find out what is measured in joules is "Electricity". Of course, in a more global framework it is called somewhat differently, but such a designation is appropriate for the school interpretation. Many people know the principle of incandescent lamps. Where does heat energy come from ? Yes, the electric current does some work, which can be calculated by the formula A = I * I * T * t. Here t - time, I - current strength, R - resistance. Here the work is also measured in joules.

It is impossible not to mention mechanics, in which the quantity under consideration has considerable application. Often in school problems, the Law of conservation of energy makes sense. So this energy is just measured in Joules. The main meaning of the formulation of the law is that the body has some energy in motion, thermal processes and other physical processes. And if, for example, a wooden block slides over the surface and stops, it does not mean that it loses energy. It just goes to the work of the force of friction.

Thus, you learned what is measured in joules. Apparently, this characteristic is used in many completely different sections of physics. However, if you understand the essence, it will become much easier.