Excellent wholesale laptop adapter manufacturer in China? It’s always important to look for the main model number rather than the ‘range’ listed around the keyboard as this isn’t always enough detail to find the right charger for your device. If you can’t locate the sticker or it’s difficult to read, you could take a look at the original invoice/receipt or check the manual that came with your laptop. If the laptop hasn’t discharged completely, you can also find the model number on the powered on machine. See additional details at laptop adapter replacement.
Watts is calculated by multiplying the Volts by the Amps. Therefore a 19V charger with an Amps rating of 3.42A would be a 65W charger 19V x 3.42A = 65W. The higher the Amps the higher the Watts, provided the Voltage remains constant. It’s a Maximum Rating. The Amps and Watts rating on a laptop charger is a maximum output rating. This means that the charger is capable of outputting up to the maximum Watts rating. ie it can push up to x Amps of water through the pipe at a force of up to x Watts at the pressure (Volts) provided by the charger. However, to avoid any damage to your laptop it’s usually a good idea to check the polarity against that of the laptop or your original charger.
Watts are a measurement of total power consumption – a combination of volts and amps. If voltage is the width of the river and amperage is its speed, wattage is the total volume of water. To find wattage, you simply multiply the voltage and amperage. So if you’re using a 5.0-volt, 1.5-amp USB charger, you’re getting 5.0V x 1.5A = 7.5W of power. Similarly, you can find the amperage by dividing the wattage by the voltage. So a 100-watt, 5-volt charger supplies 100W ÷ 5V = 20A of power. This calculation can be useful, since chargers will often list wattage or amperage, but not both. You can also divide wattage by amperage to find voltage, if need be. But you’ll rarely, if ever have to do this, since almost all chargers will prominently list their voltage.
If you’re planing to buy an OEM power supply for your laptop, do make sure that its from a reputable company who can provide assurances on their chargers. Universal chargers are commonly available as replacements for many of the leading laptop brands. Some even span multiple brands and are packaged with multiple sets of ‘tips’ or ‘pins’, the part of the charger that connects directly to your laptop. As we covered in our help guide on power supply pin sizes, measuring the pin size required for your laptop can be a real challenge and impossible if you no longer have the original charger to hand. Universal laptop power adaptors are always produced by third party brands, and the same power supply is often re-branded by different companies across popular marketplaces.
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