问:白炽灯上标明50伏40瓦是什么意思? 答:50伏和40瓦是此白炽灯的额定电压和颔定功率,表示制造厂规定此白炽灯在外加电压为50伏的情况下长期运用是经济合理的,此时灯泡消耗40瓦功率。目前,48伏电压列车中,发电机发电时,控制箱输出电压为58伏左右,大于灯泡额定电压,而灯泡消耗电功率与外加电压平方成正比,故此灯泡消耗功率远大于40瓦,消耗的电能除小部分 Q. What does it mean on an incandescent lamp that a 50-volt 40-watt is indicated? A: 50-volt and 40-watt are the rated voltage and the rated power of this incandescent lamp, indicating that the incandescent lamp is long-term at an applied voltage of 50 volts Use is economical and economical, at this moment bulb consumes 40 watts of power. At present, 48V voltage train, the generator power generation, the control box output voltage of about 58 volts, greater than the lamp rated voltage, and the lamp power consumption is proportional to the square of the applied voltage, so the lamp power consumption is much greater than 40 watts, the consumption of electricity Except a small part