I purchased a spare power adapter for my ASUS Q500A laptop. When I received it, I checked the specs and found that they differ than the OEM adapter. The OEM input is 100-240V 50-60Hz 2.0A. The spare input is 100-240V 50-60Hz 1.2A. Both outputs are listed at 19V 3.42A. Does this difference matter? Should I use the adapter or return it? Thanks...
Answer
Your original OEM adapter had a poor power factor. 2.0Amps * 100V is 200 VA of apparent power. Apparent power is the maximum amount of real and imaginary power. Real power is delivered to and absorbed by the power adapter. Imaginary power (or reactive power) is power that must be drawn in by the power supply by capacitors or inductors and then sent back to the grid.
Usually laptops take either 85 watts or 65 watts. The output of both of those adapters says they are 65 watt adapters. I don't see any issue at all with the after market adapter. If anything it has better power factor.
Power factor is the ratio between real power and apparent power. Ideally, your PS should have a PF of 1. In your case, the OEM adapter looks to have a PF of 65/200=0.325 (ignoring losses). Your after market PS has a PF of 65/120=0.54. One reason PF is important is due to the extra losses incurred by the extra current necessary to drive poor PF devices.
Lastly, if somehow the aftermarket one isn't able to produce 65 watts, the only downfall you'll have with the aftermarket adapter is that your battery may charge slightly slower.
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