If four appliances connected with 220 V AC have the same power on time, the one that consumes the most electric energy is () A. Normal luminous bulb with rated power of 100W B. electric iron with maximum current of 0.6A C. electric heater with heating rate of 40J per second D. electric iron with rated current I = 0.5A

If four appliances connected with 220 V AC have the same power on time, the one that consumes the most electric energy is () A. Normal luminous bulb with rated power of 100W B. electric iron with maximum current of 0.6A C. electric heater with heating rate of 40J per second D. electric iron with rated current I = 0.5A


A. In the time t, the power consumed is w = Pt = 100tjb, the current flowing through the electric iron is I = 0.62a & nbsp; = 0.32A, the work consumed is p = uit = 662tjc, the work consumed by the electric heater is w = Pt = 40td, and the work consumed by the electric iron is w = uit = 110t, so the electric work consumed by D is more, so select D