Insects are flying in front of us again. If you can't hit it with your bare hands and use insecticides, you can still use mosquito-killing pats. It's only when you listen to the click and smell the burnt odor that you become more addicted. But when we got the instruction of mosquito killing racket, we could not help scaring out a cold sweat - the output voltage of mosquito killing racket could exceed 2000 V. Can a mosquito swatter be used as an electric baton? Now that this question has arisen, let's see if the mosquito killing racket can actually cause harm to people.

　　Triple power grid = anti-collision

　　How does the mosquito killing racket discharge electricity to kill mosquitoes? First of all, of course, the 220 V AC voltage is changed to 2000 V DC voltage through the function of rectifier and boost transformer inside the mosquito killing racket. Then the key to the mosquito racket is the power grid.

　　It's not the power grid, it's a real live wire mesh... Careful observation of the mosquito killing racket network, it is not difficult to find, a total of three layers. The upper and lower layers are called the "outer layer" and the middle layer is called the "middle layer". The three-layer grid of mosquito killing racket is actually the two poles of HVDC line, the middle grid is the positive pole, and the outer grid is the negative pole.

　　There is a distance between the middle grid and the outer grid, which is designed according to the voltage of the mosquito killing racket. This distance is very ingenious - when the mosquito killing racket is stationary or waving, it can ensure that the two layers of power grid are insulated and can not form a path (if too close, it can not guarantee insulation); when insects contact the middle grid through the outer grid, they will break through the air gap between these distances, which will generate arc and crack (if so). Insects can't break through the arc if they are too far away. This arc is the weapon that kills mosquitoes.

　　Interestingly, the killer is the power grid, which provides protection for users, but also the power grid. Let's look back at the appearance of the mosquito-killing racket grid - the outer grid is obviously more sparse than the inner grid. There are also reasons for this:

　　In order to protect users, the mosquito killing racket puts one pole of the low potential of the power supply on the outer layer, so that when users touch the outer layer of the power grid, because of the low potential of the outer layer of the power grid, they will not form a loop with the large area, resulting in electric shock to the human body. Therefore, when people touch the outer grid, they will not be electrocuted. People don't get electric shocks, and insects don't. In order to make insects more accessible to the middle grid, the design of the outer grid is very sparse.

　　The outer grid is sparse, and there's one drawback --- the human finger can get in. But friends who have had experience in this field all know that when the finger goes in, although it will feel tingling, it will not have a greater impact on the body. (The feeling of electric shock will not be good, so remind users to remember to turn off the mosquito killer when not using the mosquito killer, especially those with children at home.) So why thousands of volts of mosquito killing racket, electricity does not kill people?

　　High Voltage + High Resistance = Small CurrentWhat makes people feel tactile is the current, which has nothing to do with the voltage. This is just another way to prove that although the mosquito killer racket can produce high voltage, it can only output small current, so it will not cause too much harm to people.

　　High voltage circuit generates small current. The principle is simple. According to Ohm's law I=U/R, it is known that only one large resistance can be connected in series in the circuit. In fact, mosquito killing rackets do the same thing. The output of high voltage is just to make it easier to break through the air gap and kill mosquitoes, or the current. If you want to electrocute a mosquito, 5 mA of current is enough (the safe current of human body is 30 mA, below which, it will not cause harm to human body).