In the measurement of electric Power consumption, it is impossible to use the commercially available measuring instruments. The reasons are (a) that EL cell itself is of low power factor load (cosφ=0.1-0.4), (b) that the frequency range for the working of the cell is comparatively wide, (c) that the power consumption of the cell is little at present, (d) that there is a distortion in the voltage and current waveform of the cell, and so on. Therefore, the correct method of measurement of electric power has been variously studied in many quarters. In this report, there are described the materials which we have recently studied about this subject and which we submitted to the Japanese Investigation Committee on EL of Illuminating Engineering Institute and No.125 Committee of Japanese Science Promotion Conference, etc. The contents of this study are the operating principles of the instantaneous indicating type electronic watt metter, for the trial manufacture of which we spent two years, and its properties, the examples of measurement of electric power by this meter, the comparison with the other methods of measurement, the representative EL properties from an applied example of electric power measurement, etc.
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