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current reaches the merits, the output voltage is reduced to 95% of nominal voltage, or other ratio, the manufacturers of the product according to the different needs of the load can be set higher or lower ratio, the current value is the nominal current. The ibm16V 72W power adapter such as the nominal current is 4.5A (16 * 4.5 = 72, nonsense). If the load resistance is too low, causing the output current exceeds the nominal current, generally two things will happen, one is the individual components of the cooling capacity of the heat caused more than burn damage caused by power, and the other is the thermal design margin left, merely reflect the output voltage is further reduced, if reduced too much may cause the load not work correctly.

Understanding of these concepts, we can determine the second issue of this article. The same nominal power supply voltage, output current is different from the same can not be used in the books. The basic principle is that a large nominal current of the power can replace the small nominal current power supply. Some friends are misunderstood, that a large nominal current of the power will burn books, because the current big thing. How much current is actually the same in the case of the voltage depends on the load, that is, the work books, when the books when the high-load operation, the current larger, the books go into standby when the current is smaller, short current equal increase in the books The voltage 

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divided by the books on the equivalent resistance. Nominal current of the power supply has a large enough current margin, will not replace the current power after a small nominal output voltage is too low or overheating situation. On the contrary, with a small current power supply to replace the current existence of such a large risk. But some friends instead of 72w with 56w of power have no problem with it because the design of the power adapter is usually left a certain margin, the load must be less than the power supply power, so this place is in general use feasible, but the remaining power supply power margin to a few, the books once you pick a lot of peripherals, such as the two usb hard drives, and cpu at full speed, then there is a base, the above read the disk to a drive at full speed, then with the same time charging the battery, estimated to dangerous, to be ready to feel the power you are not already boiled eggs. 72w more than the 16w 56w adapter is to cope with such situations. So it is best not to use low current power supply instead of high-current power supply. If you really do, conditional friends can think of ways to Test your books, when the maximum consumption of the actual needs of current measurement method is very simple, a socket, a plug, a current meter, a few wires, a 

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soldering iron can be. If the nominal current in your power within, of course, is safe.

Power adapter tips
Power adapter
1, the power adapter (hereinafter referred to as power) of the nominal voltage and current mean?
2, are of the same nominal power supply voltage, output current different, the same can not be used in the books?
3, the same machine, Managing someone else's power, I'm always very hot, and why?
4, power supply nominal voltage than my laptop battery voltage is much higher, will not trouble you?
5, why the power theory, first wife first wife is usually the power is better than non-?

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In general, regular power adapter is not necessarily true no-load voltage and nominal voltage of exactly the same as the characteristics of electronic components can not be completely consistent, it allows a certain degree of error, the need for civilian control of the situation based on usage to 0.1% about 5%. The smaller the error, the consistency requirements of the higher electronic components, industrial production, the higher the cost, the price of course, the more expensive.

Second is the power of the nominal current value. Regardless of any power supply has a certain internal resistance, so when the power supply output current when the pressure drop in internally generated, equal to the output current multiplied by the power supply internal resistance. Lead to two things, one is heat, equal to the square of the output current multiplied by resistance, so the power will be hot, and the other is the output voltage to the internal nominal voltage minus the voltage drop, causing the output voltage decreases. The design is usually considered after the completion of heat dissipation, generally limits a current value, when the output 

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