With the continuous progress of science and technology, more and more electric tools have emerged to improve work efficiency and replace heavy manual work. It is no exaggeration to say that the appearance of power tools has changed the face of the world. Tools are instruments that give human beings mechanical advantages. In the animal world, many birds and primates also use tools, but there is one thing that makes us different from them: power. Unlike other animals in the animal kingdom, we humans can not only rely on physical strength, but also drive tools through other energy sources.

　　We may not have superpowers, but we have power tools. Power tools cover all aspects of our life, including medical treatment, manufacturing, construction, rescue, etc. In the 19th century industrial revolution, factories used gas, steam and electricity to give tools more power. Since the 1960s, people have transformed power tools again to enable them to be used in ordinary families. The share of power tools in the global market is 23.4 billion US dollars. About 40% of them come from North America, 22% from Asia, and 27% from Europe. Electric tools account for about 75% of all power tools sold. Electric tools account for about 75% of all power tools sold.

　　The power of electric tools depends on how much voltage they can withstand. You can think of voltage as water pressure. The greater the pressure of water management, the stronger the water flow. The same is true for voltage. The more volts in the tool, the greater power the tool can produce. To get sufficient voltage also means to plug in the power supply, but the discovery of battery changed all this. Battery-powered tools were first used on the moon in the 1960s. Apollo astronauts needed a small hand-held electric drill to drill into the lunar surface to collect soil samples, so engineers designed a special battery pack for electric tools. Since then, the wireless drill has been produced. This unique invention was first applied to the handheld wireless vacuum cleaner launched in 1979. Later, it triggered the reform of household electric tools.

　　The power tools we know and use rely on human physical energy, electric energy, gasoline and compressed air to run, but the tools used by professionals are more powerful. In some auto events, we often see that the racing maintenance personnel use the pneumatic wrench to remove the tire, because the time limit of the event is that they must race against the clock to save time. It only takes 12 seconds for the maintenance personnel to remove the nuts of four tires, because the speed of this lightning gun wrench can reach 25000 rpm in one minute. Its power comes from compressed air, compared with the standard pneumatic wrench of 2000 rpm. The speed of the torpedo gun is 12.5 times that of them. At this speed, the nut of the tyre can be removed within 0.2 seconds. If a standard pneumatic wrench is used. Instead of a thunder gun, the 12 seconds to change the tire will become three minutes.

　　In the 19th century, there was a legendary story, in which the protagonist was John Henry, a railway construction worker. This worker was the strongest worker at that time. His job was to drive iron nails into the rail. At that time, no one could match him. Then a power tool was born. The appearance of the air hammer made people no longer need to use brute force to drive nails. The worker fearlessly challenged the air hammer, and the man-machine war began. Who can beat faster? In the end, human Henry won. But because he overdraw his strength, he died soon. Of course, this is just a legend. In today's era, even the commonly used hammers and nails cannot escape the elimination of human progress.

　　The emergence of a new electric tool nail gun, whose speed is at least ten times that of a hammer, can shoot 100 nails per minute, far exceeding the efficiency of human power. And our most common electric saw uses a two-stroke starting engine. Although it is small, it has a powerful engine that can drive equipment such as lawn mowers and motorcycles. When using the electric saw, the operator only needs to pull the rope to start the starter and drive the steel teeth on the saw chain to cut wood. The advent of these electric tools has revolutionized the construction industry.

　　Of course, in addition to manufacturing, electric tools can also be used to save lives. Electric tools can also achieve the precision of surgery. In the past, surgeons have shifted from major resection to minimally invasive surgery. In order to achieve this, doctors need technical support. Technology often means the need for power tools. We all know that surgeons will use surgical blades to make incisions. The problem is that such incisions will bleed. Now there is a power tool for surgery. Its needle tip will be heated, and it can cut and coagulate wounds with high temperature like a scalpel. Coagulation means hemostasis, which is very important for surgeons. It is driven by human beings to turn materials into endless high-tech equipment and inject real power into power tools.