Why ubuntu uses more battery power than windows?
When I use windows, my battery lasts for 2 hours
But when I use ubuntu, the battery decreases so quickly. hardly I can use for only 1 hour.
Why ubuntu uses more battery?
First I recommend you to upgrade to Ubuntu 12.04LTS. To know why Ubuntu uses more battery power you could look into this site.
You can improve your battery life by installing Jupiter.
It is designed to improve battery life of a portable Linux computer by integrating with the operating system and changing parameters of the computer based on battery or powered connection.
You can install Jupiter by typing the following commands.
Open a terminal window (alt+ctrl+t) and type
i advise you to check out this "link" about Power Saving Tweaks.
You can also install powertop which is a Linux tool to find out what is using power on a laptop. you can get it here.