Join Date: Jan 2005
Location: Scarborough, Ontario
If it's not obviously identified, putting on a sticker, etching, or otherwise identifying what equipment the adapter is for, when you first get it, can be helpful for when the adapter becomes separated from the equipment. If every adapter in your house has an indication of what it's for, then it's harder to make a mistake.
Also, when you get new equipment, if it doesn't have what voltage, current, AC or DC, and polarity of the connector (if DC) that it requires written on it, then you should mark it on it yourself, from what's on the adapter, in case the adapter gets lost and you need to replace it.