Thermal wattmeter with direct power conversion

A thermal wattmeter with a novel method of direct power to voltage conversion is described. The conversion is based on power substitution by a three-terminal thermoconverter (TTTC). The TTTC is principally a thermally isolated heater with dynamically controlled impedance enabling simultaneous application of mutually independent current and voltage. The power dissipated in the heater is directly converted into output voltage or current in dual self-balancing thermal bridge circuit.<>