Heating with power cable.

I have next configuration :
And I observe something. When Power supply it's connected, CPU become very hot, and Ac power it's dis, the temperature drop down .
What should I do?
It's that a problem.
I have 45 celsius in CPU. when it's disconected. And that in browsing some apps open, like torrent , music player.., and maybe adobe dreamweaver..


Field Value
Computer
Computer Type ACPI x64-based PC (Mobile)
Operating System Microsoft Windows 8.1
OS Service Pack -
Internet Explorer 11.0.9600.16438
DirectX DirectX 11.0
Computer Name EMILIAN
User Name Emilian
Logon Domain EMILIAN
Date / Time 2014-01-26 / 02:15

Motherboard
CPU Type Mobile QuadCore AMD A8-5550M, 2100 MHz (21 x 100)
Motherboard Name Asus X550DP Series Notebook
Motherboard Chipset AMD Bolton, AMD K15.1
System Memory 3282 MB (DDR3-1600 DDR3 SDRAM)
DIMM2: SK Hynix HMT451S6AFR8A-PB 4 GB DDR3-1600 DDR3 SDRAM (11-11-11-28 @ 800 MHz) (10-10-10-27 @ 761 MHz) (9-9-9-24 @ 685 MHz) (8-8-8-22 @ 609 MHz) (7-7-7-19 @ 533 MHz) (6-6-6-16 @ 457 MHz) (5-5-5-14 @ 380 MHz)
BIOS Type AMI (09/09/2013)

Display
Video Adapter AMD Radeon HD 8550G (768 MB)
Video Adapter AMD Radeon HD 8550G (768 MB)
Video Adapter AMD Radeon HD 8550G (768 MB)
3D Accelerator AMD Radeon HD 8550G (Richland)
Monitor CMN N156BGE-L41 [15.6" LCD]

Multimedia
Audio Adapter ATI Radeon HDMI @ AMD K15.1 - High Definition Audio Controller
Audio Adapter Realtek ALC269 @ AMD Bolton FCH - High Definition Audio Controller

Storage
IDE Controller AMD SATA Controller
Storage Controller Microsoft Storage Spaces Controller
Disk Drive HGST HTS 545050A7E680 SATA Disk Device (500 GB, 5400 RPM, SATA-III)
Optical Drive DTSOFT Virtual CdRom Device
Optical Drive MATSHITA DVD-RAM UJ8C2 S (DVD+R9:6x, DVD-R9:6x, DVD+RW:8x/8x, DVD-RW:8x/6x, DVD-RAM:5x, DVD-ROM:8x, CD:24x/16x/24x DVD+RW/DVD-RW/DVD-RAM)
SMART Hard Disks Status OK

Partitions
C: (NTFS) 248.6 GB (193.1 GB free)
D: (NTFS) 205.1 GB (150.8 GB free)
Total Size 453.7 GB (343.9 GB free)

Yes, electrons moving around in a fast manner tends to produce a temperature raise.

Is there some kind of issue with using the machine that you're specifically trying to fix?

When you have it connected to the wall, the power plan changes and lets the machine work more to its abilities. When it is not connected to the wall, it changes certain things to not work as fast as possible (or things like dimming screen) so that power can be saved and battery life is extended so it doesn't need a recharge so soon.

What you're describing is normal operations.

Like MasterChief says it may run differently when plugged in versus unplugged. My laptop will switch from the dedicated graphics card to the onboard video chip in my processor. The CPU will run slower too at a lower clock speed to save battery. My display backlight will dim when on battery only. If you were running on battery and then plugged the power pack back in your laptop also has to recharge the battery on top of whatever else its doing. That may generate even more heat.