Make sure you have the facts needed to order the correct power adapter!
Determine output voltage and current type required
For most household applications, this will be between 3 V and 24 V. Most adapters are DC (direct current), rather than AC (alternating current),but don't take it for granted!
Determine whether you need a regulated or unregulated adapter
Some devices require a regulated power adapter, which keeps output voltage and current constant. Never use an unregulated power adapter to replace a regulated one!
Determine your device's current draw
This will be measured in Amps or Milliamps (A or mA). Never replace an adapter with one rated for less current, although in some cases it may be acceptable to increase the current rating.
Is it USB?
Originally developed for computer peripherals, USB is becoming a popular way to power and charge electronic devices. It may seem simple, but you'll need to navigate current rating and the differences between USB, USB Mini, and USB Micro.
Determine the plug's style, shape, and polarity
The most common style of power adapter plug is the 2.1 mm or 2.5 mm "barrel". Knowing the characteristics of the plug that matches your device's socket is essential to choosing the correct adapter.