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灯泡亮度是由灯泡消耗的实际功率决定的,实际功率越大,灯泡就越亮,因而要判断灯泡的亮度变化,只要分析灯泡消耗的实际功率即可.一、串、并联电路中灯泡亮度的变化分析例1 在如图1所示的两个电路中,电源电压不变,闭合S,当滑动变阻器的滑片P都向右滑动时,灯L1和L2的亮度变化是( ). (A)都变亮 (B)都变暗 (c)L1变亮,L2变暗 (D)L1变暗,L2的亮度不变 (2001,四川)
Lamp brightness is determined by the actual power consumed by the lamp. The greater the actual power, the brighter the lamp. Therefore, to determine the brightness of the lamp, simply analyze the actual power consumed by the lamp. I. The brightness of the lamp in series and parallel circuits. Variation Analysis Example 1 In the two circuits shown in Fig. 1, the power supply voltage does not change, and S is closed. When the slide P of the sliding varistor slides to the right, the changes in the brightness of the lamps L1 and L2 are (). (A ) Lightens (B) Darkens (c) L1 brightens, L2 darkens (D) L1 darkens, and L2 brightness does not change (2001, Sichuan)