This image [left] is a good example of the Rule of Thirds The wheel arch of the car is in the bottom right intersect of the frame and the tower is close to the left hand vertical line. (The lines were added in Photoshop)
This
Image [Right] is not so well framed, the subject of the image, the plug (as
mundane as it is) is in the center of the frame. I have cropped it in
photoshop so the plug appears in the top right side of the frame... This
makes the image look alot more effective. I have also kept the wires in the frame because it shows the level of Depth of Field in the image. [below]
The lines on the image are only rough and not the exact rule of thirds. They are just added so you 'the viewer' gets the idea.