How to determine electrical energy consumed by knowing the current of motor?
For single-phase AC, power is voltage X current X power factor. Power factor is a number between zero and one that indicates how closely the voltage and current waveforms coincide with each other. The power factor for full load may be marked on the motor. A typical motor will have a high power factor, perhaps 0.8 to 0.9 at full load, but a low power factor, perhaps less than 0.2 when it is lightly loaded. If the full-load current is marked on the motor, you can compare the measured current with the full-load current to estimate hoo heavily the motor is loaded. With no load, the motor current will likely be in the area of 1/3 of full-load current.