A device and a method are suitable for use in measuring electric current within an electrical system. The device comprises a current sensor for generating a first signal representative of the electric current within at least one portion of the electrical system, a processor coupled to the output of the current sensor for digitally generating a second signal representative of electric current data based on the first signal, and a transceiver coupled to the processor, where the transceiver transmits the electric current data representative of the second signal to a data collection unit for storage and analysis. The device can be used in the electrical systems of vehicles such as automobiles and trucks; construction, agriculture, and mining equipment; trains; aircraft; and stationary equipment such as generators.