A hair dryer uses 1500 W of power from a source of 120V, what is the current?

Simple


Power = Current * Voltage


Therefore


1500 W = I * 120 V





I = 12.5 A





cheersA hair dryer uses 1500 W of power from a source of 120V, what is the current?
power= Voltage * Current = Voltage ^2 /.Resistance = Current ^2 *resistance





Here we can use current -voltage relation.





Power = 1500 w, Voltage = 120 V. so, current= power/voltage = 1500/120=12.5 A.





** just to remind you, if u are working with AC source, then do not forget to work with r.m.s value.


if your given data was for AC source and it was magnitude of voltage, then Vrms=Vmax /sqrt(2)=120/1.414=84.87v


then current (rms) = power/voltage=1500/84.87=17.67A and converting it to magnitude=rms value * sqrt(2)=17.67*1.414=25A