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在许多参考书以及各省、市的会考,毕业考,升学考等试题中,常常有一些关于灯泡亮度如何变化等问题,学生感到模糊,难以作出正确的判断.我们在比较灯泡的亮暗及其变化时,不能只比较流过灯泡的电流大小或只比较灯泡两端电压的高低,更不能只比较灯泡额定功率的大小.而只能用灯泡实际功率大小来判断.若灯泡的实际功率等于额定功率.则灯泡
In many reference books and exams for provincial and city entrance exams, graduation exams, and entrance exams, there are often questions about how the brightness of the light bulb changes. Students feel vague and it is difficult to make correct judgments. We are comparing the brightness and darkness of light bulbs. When you change, you can’t just compare the current flowing through the bulb or just compare the voltage across the bulb. You can’t just compare the bulb’s rated power. You can only use the actual power of the bulb to determine if the bulb’s actual power is equal to the rated value. Power. The light bulb