Conclusion: MacBookPro notebook does not generate static electricity, and sometimes people feel numb because the human body is charged with static electricity and discharges the metal shell of the notebook. Discharge: There is no harm except slight discomfort to people. Many friends who have used MacBookPro have reported that charging MacBookPro is inevitable, even protecting the grounded power cord. The listing of MA895-897 did not solve the problem of charging.
I feel numb when I touch my notebook. It's terrible! Now it has been spread by some friends as a defect of MacBookPro. Apple fans love me, love my dog, and know that there are tigers in the mountains. Ordinary users began to wonder whether they should buy this notebook. Will the Apple computer be powered on? To prevent electric shock! ?
According to common sense, it shouldn't, but it won't be known for a while. I have never seen or used the MacBookPro. However, after analyzing the knowledge of physics and electricity these days, I finally understand what is going on, and post it to share with you.
First of all, it can't be caused by the leakage of the laptop. Large international companies have strict quality control and factory inspection, and it is unreasonable for a large number of products to leak electricity. Even if there is leakage, it will not be returned to people after grounding. Besides, sometimes you don't need an external power supply, and you can still electrocute people with batteries!
Ben has static electricity? It seems reasonable. Everyone explained that static electricity has become a defect in MBP notebooks.
This is not right. If an object with static electricity is grounded, will static electricity discharge or shock people?
In fact, it's very simple. It's not the laptop that has static electricity, but you have static electricity!
When the human body is well insulated from the ground and the air is dry, human activities (such as rubbing clothes) will generate static electricity, which will gradually accumulate, and the potential can reach several thousand volts to tens of thousands of volts.
For example, when the human body touches other objects, it will discharge due to different potentials. If you touch someone, both of them will be numb, and grabbing a doorknob will get an electric shock. Everyone has experienced this. Naturally, it is not surprising that you are shocked when you come into contact with a laptop with static electricity.
No, other brands of notebooks will do! Is Xiao Bai okay? How to explain it?
The problem lies in Full Metal Jacket of MacBookPro notebook.
On (aluminum alloy surface is oxidized after stamping, and the insulating layer is extremely thin). Other notebooks are either plastic shell, metal die-casting frame and plastic outer frame (for decoration and secondary protection). When the charged human body touches them, the discharge current is relatively small, so it cannot be felt. 15.4 or even 17 inch notebook.
The capacitance between the upper and lower metal covers and the ground is relatively large. Even if it is insulated from the ground, the human body will feel the discharge after contact (grounding is more severe). Although MB06 1-063 of plastic case uses the same electricity,
Source converter, but there is no electrostatic problem, which has nothing to do with leakage.
The discharge of the shell will not affect the internal work of the computer, but when the external interface of any brand notebook computer is discharged, although the interface circuit has quite strong antistatic ability, too high discharge potential will also have adverse effects. Please get into the habit of not touching the external interface of the laptop with your hands when using it.
P.S. There is also a human body current. When using commercial power, the power converter has a step-down transformer (whether it is a switching power supply or a common power frequency power supply transformer). Although there is good insulation between its primary windings, there is a certain distributed capacitance between the primary windings, which can be passed by alternating current. After the power supply is connected to 220VJ alternating current, if it is measured with a highly sensitive electric meter, there will be a current (microampere level). This capacitive current is so small and harmless that ordinary people can't feel it, but some sensitive people will feel it through such a small current. Capacitive current may exist in almost all electrical appliances, even the medical equipment with the strictest safety standards (the medical equipment safety standards stipulate that the leakage current of floor drain is 0.5mA, and the leakage current of bushing and patient is 0. 1mA). If a three-core power socket is used, the primary and secondary coils are isolated and grounded to shunt the capacitor current.