In life, situations sometimes happen when an urgent need to solve a question related to how to find power, that is, a value associated with the categories of work and time. This physical parameter is important because it allows one to determine
many meanings. For example, using it, you can easily calculate the time in which a given amount of work will be completed. It also characterizes, indirectly, of course, the performance of various types of engines. Based on this value, you can also determine, for example, fuel consumption. That is, it is important both for physics and for economics. Therefore, the solution of the question related to how to find power has important applied and practical value.
Units
Conventionally , power units can be divided into system and non-system units . In the first case, it is a watt (W or W) and a number of multiple and fractional units, the designations of which are formed by adding a prefix to the aforementioned base. For example, a kilowatt is one thousand watts. At the physical level, this unit characterizes the work that will be done in a time interval. Among non-system units, the so-called "horsepower" was most widely used. This is due to the fact that the power of most internal combustion engines today is measured
It is in these units. The ratio between them is as follows - one
horsepower is 735 and a half watts. Once we have decided on in what units the physical parameter is measured, we will answer the question of how to find power in physics and in electronics.
Physics
Power in physics is directly related to another important parameter - work. The necessary indicator is time. In essence, power can be determined from work that has been done over a given period of time. From here follows the power calculation formula, which is as follows: N = A / t. The following notation is used in this formula: N - power in system units, A - work measured in joules, t - time in seconds. So, A shows the necessary amount of work, and N indicates the part of it that needs to be done from the total volume in order to have time to do it for a given interval t.
Electrical Engineering
In electrical engineering, unlike physics, everything is much simpler. Both in theory and in practice. Theoretically, the same parameter is determined by the product of specific values of current and voltage. That is, the formula has the form P = U * I. Here P is the power in all the same watts. U is the voltage measured in volts, and I is the amperage.
The formula is universal, that is, the above expression is valid for both direct and alternating current. With its help, you can easily determine the power value for any device. Moreover, in practice, one device is enough - a multimeter. First, we determine the voltage by parallel measurement, and then the current strength by sequential measurement. Often this way you can find the answer to the question of how to find
engine power. Alternatively, a wattmeter can be used to take readings. But such measuring equipment is very expensive, for this reason it has not yet become widespread. But multimeters have already firmly entered our lives and are finding more and more use every day. They also have great versatility, which compares them favorably with other devices that are highly specialized.
Summary
The article helps to find the answer to the question of how to find power in physics and in electrical engineering. From the point of view of practice, in electronics this parameter is much easier to determine. But if you wish, using modern technical means, you can solve the problem of any complexity, in any field.