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一、额定功率和实际功率的关系式例1一个标有“220V,100W”的灯泡,如果把它接在电压分别为220 V、110 V和55 V的电源上,它的实际功率分别为多少?解析:灯泡上标着的“220 V,100 W”是该灯泡的额定电压和额定功率,当它接在220 V电源上时,U_实=U_额,则P_实=P_额=100 W.如果电灯两端的电压高于额定电压,它的实际功率就高于额定功率,灯丝容易烧坏.如果低于
First, the rated power and the actual power relationship Example 1 A marked “220V, 100W ” of the bulb, if it is connected to the voltage of 220 V, 110 V and 55 V power supply, respectively, its actual power respectively What is the resolution ?: “220 V, 100 W” marked on the lamp is the rated voltage and rated power of the lamp. When it is connected to the 220 V power supply, Real = P_Equation = 100 W. If the voltage across the lamp is higher than the rated voltage, its actual power is higher than the rated power and the filament will burn out easily.