Results 1 to 5 of 5

Thread: wattage calculation confusion

  1. #1
    Join Date
    Jul 2005

    wattage calculation confusion

    hi all,

    i'm trying to calculate the wattage of my laptop. i think i know how, but i'm still confused.

    the power adapter says:
    100v-240v ~ .95a-.55a
    15v ~ 3a

    using p=ie, does this mean that @ 100v, i am using 95 watts, @ 240v i'm using 132 watts, and @ 15v, i'm using 45 watts? that doesn't seem quite right to me. i thought that the power consumption would be constant regardless of the wattage.

    i just ordered a dc/dc power brick that plugs into my cig adapter. so does this mean that i'll be using half as much wattage compared to plugging it in at home?



  2. #2
    Low Bitrate
    Join Date
    May 2005
    i think the top set is the input and the bottom the output, over the variable input voltage there is a constant output wattage of 45watts.

  3. #3
    Admin. Linux loser.
    Auto Apps:loading...
    Bugbyte's Avatar
    Join Date
    Sep 2004
    Corning, NY
    Blog Entries
    I believe the bottom number is your laptop's power consumption.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  4. #4
    Join Date
    Jul 2005

    thanks everyone!


  5. #5
    Maximum Bitrate KyleYankan's Avatar
    Join Date
    Mar 2005
    yeah - AC adapters are usually VERY unefficient. Mine gets so hot that you can burn yourself on it.

Similar Threads

  1. Confusion Says
    By Enforcer in forum Off Topic
    Replies: 18
    Last Post: 01-30-2007, 02:22 PM
  2. How do i calculate the amp wattage i need?
    By Blop in forum Car Audio
    Replies: 7
    Last Post: 05-23-2005, 12:47 PM
  3. Best way to determine wattage?
    By maxxell in forum General Hardware Discussion
    Replies: 4
    Last Post: 04-21-2005, 06:38 PM
  4. wattage of processors - sempron/intel cel "D"
    By fuctup in forum General Hardware Discussion
    Replies: 23
    Last Post: 12-23-2004, 11:31 PM
  5. AC Wattage vs. DC Wattage
    By SwapMeet in forum Power Supplies
    Replies: 4
    Last Post: 11-09-2004, 01:03 AM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts