Adapters that turn household alternating current into 12-volt direct current are widely available from major retailers, including Amazon.com and Radio Shack. The website 12vAdapters.com also stocks these adapters.
Battery chargers, laptops, digital picture frames, household printers and other small electronic devices commonly require 12-volt direct current. These devices normally come with their own adapters. Some devices only draw one milli-ampere of current, while others draw many times that, so an adapter must have an amperage rating of at least that of the device it powers. Its plug must also match the device, and separate plug adapters are common. Shoppers find adapters that meet the requirements of specific devices on 12vAdapters.com.