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The Royal Spanish Academy (RAE ) recognizes the term watt as a synonym for watt. Watt, in fact, comes from the last name of the engineer and mathematician James Watt (1736 -1819 ), a scientist who did an important job in creating the steam engine.

This Scotsman invented mathematical application instruments for the Glasgow University and built various Newcomen machines until he could perfect the system. In 1784 , patented the steam machine and, sixteen years later, he retired to Heathfield Hall , an English town near Birmingham .

To really understand this concept it is necessary to establish before electric power , which refers to the ability of a team to operate with a certain amount of "fuel." When connecting a device to the electrical voltage the Energy that until it arrives it begins to flow through the driver and allows the device to begin to develop the functions for which it was programmed, example: a lamp illuminates when you press the light switch. It is necessary to say that energy is not something that can be created or destroyed, but is transformed, electrical energy for example is transformed allowing obtaining light, heat, cold or movement .

There are many ways to measure energy, according to the ways in which it is represented, that is, if it is electric, hydraulic, wind or caloric . Hydraulic energy (that found in liquids), its power can be measured by calculating the number of liters that can be transferred in a second, while the electrical power allows to know at what speed becomes electrical energy in heat, movement or any of the ways in which this type of energy can be converted.

That is to say that the electrical power (represented by the watt or watt ) establishes at what speed electrical energy can be transformed. It is a unit that is used in the International System of Units (YES ) and that is written with the symbol W , which derives from the basics of the SI and is equivalent to 1 Joule per second (1J / s ). The Joule is the measure used to count the amount of energy used and is represented by the letter J. This means that if 1 Joule is consumed in a second, 1 watt of electrical power would be consumed.

As a unit belonging to the SI, the watt was accepted by the II Congress of the British Association for the Advancement of Science in the year 1889 and for the XI General Conference of Weights and Measures that developed in 1960 .

If expressed in the units that are used in electricity, the watt is defined as the power generated according to the difference between an electric current of 1 amp (1 VA ) and 1 volt. This means that low power electrical devices can be defined according to their watts, although those of high power appeal to kilowatts (kW ). A kW is equal to 1,000 watts and 1,35984 hp (horsepower ).

Another unit derived from the watt is the megawatt whose symbol is MW and equals one million watts. This unit of measure is used in larger electric motors, in laser machines and on warships.

It is necessary to clarify that if power supplies they are constant, which occurs in almost all electric power providers, it can be stated with certainty that the higher the power of the electrical equipment being used, the greater the amperage That travels through the circuits. Nowadays, companies usually send a voltage lower than 220 V, which can cause the energy consumption to increase as the voltage drops and the devices end up burning due to this harmful phase-out in the electric movement.

Finally, it should be noted that if we want to know the device consumption electrical, we can read what it puts on the sheet metal, it is usually located on the back of the device. It is very important that the devices do not receive less voltage than the one said in this circuit and that, in case of low voltage they are disconnected because otherwise they will burn.

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