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判定一个灯泡的亮暗变化或者比较两个灯泡谁亮谁暗,其标准取决于实际功率的大小.消耗的实际功率越大,即单位时间内消耗的电能越多,从而单位时间内电灯转化成的光能越多,电灯就越亮.电灯标有额定功率和额定电压,可算出其额定电流及正常工作时的电阻.虽然电灯在非额定电压下工作时的电阻和它正常工作时的电阻会有大的差异,但一般题目中都
Determine the brightness and darkness of a light bulb or compare two light bulbs who is bright and dark, the standard depends on the size of the actual power. The greater the actual power consumed, that is, the more electrical energy consumed per unit of time, thus converting the lamp into electricity per unit of time. The more light energy there is, the brighter the lamp is. The lamp is marked with rated power and rated voltage, and its rated current and resistance during normal operation can be calculated. Although the lamp operates at a non- rated voltage and its resistance during normal operation There will be big differences, but in general topics are