PwrDrain is a Windows Sidebar gadget that shows the system's power usage in real time. This Sidebar gadget isn't quite "yet another power meter" for your laptop battery: while most power meters show the remaining battery charge (similar to the task bar icon that's included in Windows), this one shows the current power drain in real time.

This means that if you start doing something thats power intensive, like turning on WiFi, turning up the display brightness, or plugging in lots of USB devices, youll be alerted immediately about the increased consumption.

The license of this software is Free, you can free download and free use this desktop utility software.