Hi, for a physics project we have to find the power usage of household appliances. My charger says "60W inputAC 100-240V 1.5A output 16.5-3.65V" Would the watts just be 60W? Or would I have to calculate the amount by using P=AMPsx120volts (provided by my teacher)? My other charger says "input 100-240V output 5.1V=850mA 0.2A" How would I calculate the amount of watts for this charger? Would I use P=AMPxvolts? I'm not sure what number to use for the volts and AMPs because it lists a few numbers (as I stated above) Thanks!