ELECTRICITY COST MONITOR

摘要

A method and apparatus for real time monitoring of power consumption of various loads by an end user utilizes conventional current and voltage measuring means to determine instantaneous power consumption, and a computer displays these values to the user, as well as recent historical values over a selcted period of time. In a preferred embodiment of the invention a relatively few number of samples are taken per cycle, the samples being distributed such that over a selected number of cycles the samples cover the entire waveform cycle equally. An average instantaneous power determination is then calculated over the sampling interval and displayed on the computer.