One of the most important features of portable electronic devices has become their power consumption, which directly affect their working time. One of the ways to accurately monitor and control power dissipation is to measure current going from the battery into separate power converters and further to different peripherals. The accurate sensing of each current portion gives better information of which device consumes more power and gives more opportunities for both internal and external control to limit the loss. The aim of this work is to analyze the main power sources and their current...