Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.


  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Day 24. Laptops and Printers > Power Settings and Electrical Input Devices

Power Settings and Electrical Input Devices

Laptops and portable devices run on batteries that are charged by a DC power supply. The wall power is 120V AC. A transformer converts that to a DC voltage level and amperage that the laptop or portable device expects to get. Do not assume that because the power connector fits physically that that means it “fits” electrically. It would be sad to fry your favorite cell phone because you gave the battery too much power too fast. Read the back of the transformer. The output of it should match the expected input of the portable device.

Autoswitching Power Supplies and Fixed-Input Power Supplies

A fixed-input power supply expects a predetermined AC voltage input. In contrast, an autoswitching power supply is designed to accept a variety of AC inputs. These allow users to travel to countries that use many different voltage standards.


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint