System and apparatus for monitoring the performance of an electrically powered device

A system comprising:

• a monitoring device including a current sensor arranged to sense current drawn by an electric motor of a power tool configured to drive an operation member to perform an operation on a workpiece, the monitoring device configured to generate a sensed current waveform from the current sensed by the current sensor over one or more operating cycles of the power tool;
• a computing device arranged to receive the sensed current waveform from the monitoring device, the computing device including a processor configured to compare one or more characteristics of the sensed current waveform to one or more characteristics of one or more predetermined current waveforms to determine an operating performance parameter of the power tool;
• a user interface in communication with the computing device and configured to present an indicator of the operating performance parameter,
• wherein the power tool comprises a saw, the operating member comprises a saw blade, and the operating performance parameter includes at least one of a type of the workpiece being cut, a shape of the workpiece being cut, a number of cuts by the saw blade, or an average time per cut by the saw blade.