Patent ID: 8779753

Claim:
A method for sensing AC current drain through a primary coil of a current transformer made of a low ohmic metal alloy wire by a load connected to an electrical device selected from a group comprising AC outlet, AC plug, AC current sensing unit and AC current sensing adaptor, each including said current transformer connected to at least one of a terminal selected from a group comprising a power pin, a power socket, AC terminal and a combination thereof for connecting and conducting the current drawn by said load through said terminal and said primary coil, said electrical device further comprising a CPU and a current signal amplifier for amplifying a voltage drop developing over said primary coil, said method comprising the steps of: a. connecting a load to said AC device; b. operating said load; c. feeding the voltage drop developing over said primary coil made of low ohmic metal alloy to said amplifier; d. amplifying said voltage drop signal; and e. feeding the amplified signal to said CPU for processing.