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灯泡的发光情况取决于它的实际功率,当实际功率比额定功率小很多时,即使有电流通过小灯泡,也有可能小灯泡不发光(不亮),许多家电上的指示灯就是这种情况.怎样才能使两个串联的小灯泡满足上述条件而实现一个亮一个不亮呢?本文结合与日常生活联系密切的二个例题来讨论这一问题.
The light emission of the light bulb depends on its actual power. When the actual power is much lower than the rated power, even if there is current flowing through the small light bulb, there is a possibility that the small light bulb will not light (unlit), and the indicator light on many home appliances is such a situation. How can we make two light bulbs connected in series meet the above conditions to achieve a bright one? This article combines two examples with daily life to discuss this issue.