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Is Power Consumption Measured Through Input (voltage X Amp) Or Output (voltage X Amp)? - Math Discussion

Is power consumption measured through input (voltage x amp) or output (voltage x amp)?

i have a power ac adapter i have to measure the amount of watts consumed through it . its input is 90-270v~47/52hz 0.8A
and output is :12v --- 1.5A. whether i should calculate with input or output values.