CompTIA A+® Certification All-In-One For Dummies®, 2nd Edition

7.3. Understanding AC Adapters

An AC (alternating current) adapter is nothing new to anyone who has worked with electronic devices. The AC adapter on a laptop, just like on an electric razor or a Game Boy, supplies power to the battery to supply power to the laptop and all its components. An AC adapter also recharges the battery so that you can use it when you are on the road. For example, I am writing this text in a coffee shop and running my laptop off my battery, which was charged up last night by the AC adapter. Figure 7-5 shows an AC adapter.

Be sure to use only the AC adapter that came with your laptop or one approved by the laptop manufacturer. Although other adapters might fit your computer, the voltage and amperage might not match the laptop and could cause damage.

Figure 7.5. An AC adapter supplies power to the laptop and charges the battery.

7.3.1. AC adapter problems

When it comes to AC adapters, there are not a lot of issues that can arise. Two major problems that you will encounter with AC adapters are

• Cable problems: One major issue that can arise when you travel a lot with a laptop is a break in the cable from wrapping the cables. When you have cable problems, it's best to simply order a replacement adapter.

• AC port damage: Another major AC adapter problem is ...