Get out the sandpaper, grinders and wire brushes! Physical removal of rust involves using something harder that the rust you want to remove and using it to wipe off that iron oxide. Wire brushing will take the longest time, sandpaper is better and if you use a power tool or air tool it's even faster.
The amperage rating isn't sufficient (as noted) and it isn't necessarily the same polarity either. You can possibly check if there is a polarity diagram on the adapters. In general, laptop power supplies are not interchangeable. So probably safe and unlikely to catch fire is about the best advice you'll get. posted by chairface at 4:47 PM on December 20, 2007. Thanks; I think I'll just wait and get a new replacement adapter tomorrow-just to be safe.
Also, one of the requirements for a computer power supply to be considered Energy Star compliant is that it has a power factor of at least .90. What is power factor correction? Poor power factor can be corrected by adding some form of power factor correction to the AC input of the power supply. Power Factor Correction comes in two forms: Active Power Factor Correction, or APFC, and Passive Power Factor Correction. Computer power supplies can create harmonics of the same frequency as the input current, due to the non-linear load caused by the bridge-rectifier doing the AC to DC conversion, and typically have poor power factor (typically 0.55 to 0.65).