It is important to choose the right kind of AC power adapter for your laptop as it needs to be powered in the correct way. Choosing these devices becomes a really tricky issue when you consider there are different AC adapters for different models of laptops. In understanding certain tips, it will definitely be easier for you to select the right kind of adapter for your laptop. Given below are some of these tips:
1] First up, you need to understand your adapter
You need to take a good look at your original adapter and make sure that you buy another that is similar to this device. Adapter manufacturers generally provide users with unique code that can be used while finding a new device for you. But you still need to make sure that the new adapter is compatible with your laptop as the wrong ones can damage your device permanently. Thankfully, there are many search engines on the net where you can search for these adapters based on the unique code provided to you.
2] Check the volts correctly
It is important to check the volts before proceeding to buy AC adapters. As each laptop is different, different energy levels are used by them to operate. The amount of volts consumed by your laptop is generally printed at the bottom of the device by the manufacturer. To can ascertain these details by going through the user manual provided with the device. If you use an AC adapter with fewer volts than originally required in first place, then chances are that it might not work or might get damaged. You also need to know that there are universal adapters available for laptops these days. Most of these adapters are designed to work on different devices. But here again, there are certain exceptions. Though both adapters can be used with your laptop, you need to choose one based on parameters like volts and your preference.
3] Watch out for power ratings
Power outlets in different countries have different power ratings. Therefore, if you are planning to leave the country, then you need to make sure that your laptop AC adapter will work well with the power outlets available in the place you are visiting. To be on the safer side, you need to know the power ratings of the outlets you are going to use. To know the power ratings with which your adapter will be compatible with, you need to read the specifications section of the guide that is provided to you at the time of purchasing the device.
Source From：
http://ezinearticles.com/?Buying-a-Laptop-AC-Adapter-Made-Easy&id=7136737
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