A power supply for electronic devices. Also called an "AC adapter" or "charger," power adapters plug into a wall outlet and convert AC to a single DC voltage. Computers use multiple DC voltages ...

Right now, Amazon has the TP-Link AC1300 USB WiFi Adapter for $19.98, down from its usual price of $24.99. That’s $10.99 off and a discount of 20%.

Unless you’re particularly fond of having multiple types of batteries and chargers, you’d do well to make sure all your portable power tools are made by the same company. But what do you do if ...