physics - the science of the natural areas.Perhaps that is why it pays great attention in the school course.Often students are faced with the question of what is measured in joules.It is to be expected, since different sections of physics can include this value.However, if you try a little understanding of the topic, it immediately becomes everything in its place.Where you can meet what is measured in joules?The answer is not simple, but understandable.
It all starts with a simple formula A = F * S.In a similar dependence control work can be caught after the first month of dating with physics.If you just realize what was happening, then we can start quite well acquainted with the science.F - the sum of all active forces applied to the body, which was influenced by a change in body position.It is measured in Newtons.The judgment that the force is measured in joules, is incorrect.S - the way that the body passed.In SI units it is indicated by meter.Thus, 1 J = 1 N * 1 m. That is, in fact, we found the work from a physical point of view.It does not matter by whom and under what circumstances it was made.
Further, as a rule, in the eighth grade study the thermal processes.It introduced many new concepts.The basic formula: Q = cm (t1-t2).Here again the question arises, which is measured in Joules in this dependence.And by the way, note that there was some incomprehensible variable c.In fact it is the specific heat of the substance.It should be noted that it is usually a constant, measured for a long time.Its dimension: J / (kg * degrees Celsius).Hence it is easy to see that this amount is multiplied by the mass and to a certain temperature, we obtain joules.That is the letter Q. This, then measured them.It is said that in fact the heat - energy.For example, in internal combustion engines is first released Q, which then proceeds with a certain efficiency to A = F * S.This, in principle, may be based some problems for the Olympiad 7-8 class.
Another big section that should be considered in order to find out what is measured in joules, is the "Electricity".Of course, in a global framework called it a little differently, but the treatment is suitable for school and such a designation.Many know on what principle is based bulbs.Whence comes the thermal energy?Yes, the electric current does some work, which can be calculated according to the formula A = I * I * T * t.Here, t - time, I - current, R - resistance.Here, work is also measured in joules.
can not say about the mechanics, which deals with the use of a considerable quantity has.Often, problems in school makes sense to the law of conservation of energy.So this energy is precisely measured in joules.The basic meaning of the wording of the law is that the body has a kind of energy in motion, thermal processes and other physical processes.And if, for example, a piece of wood slides along the surface and stops, it does not mean that it loses energy.She just goes to work friction.
So, you know, that is measured in joules.As you can see, this characteristic is used in many very different branches of physics.However, if you understand the essence, it will be much easier.
