The power supply voltage, the output current is different, can be used on the same laptop. The basic principle is that a large nominal current power supply can replace a small nominal current power supply. It is estimated that some people think that the large nominal current of the power supply will burn the laptop, because the current is big. In fact, how much electricity in the same voltage situation depends on the load, hehe, think about the physics of junior high school know.
When the laptop high load operation, the current is larger, the notebook into standby, the current is smaller, large nominal current power supply has enough current allowance. Conversely, someone with 56w power supply instead of 72w to use up also no problem, because usually the design of the power adapter to leave a certain amount of allowance, load power is less than the power supply, so this replacement in general use is feasible, but the residual power supply power is very small, once your laptop is connected to a lot of peripherals, such as two USB hard disk, and then the CPU running at full speed, and then there is a base, a CD-ROM drive full speed reading, coupled with the battery at the same time to charge, the estimated danger, Feel free to touch your power with your hands at any time. So it is best not to use a small current power supply instead of a large current.