Which component is responsible for commanding the other components of the computer?

The central processing unit.
   It has the acronym CPU. This is an electronic hardware inside a PC that completes the guidelines of a PC program by playing out the fundamental number juggling between 1 and 0 which only the computer understands, coherent, control and info/yield (I/O) operations determined by the directions as programmed for the computer to function. It is considered as the power house or the computer because all other parts get processed from here.