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在解电学有关问题时,常接触到串联用电器耐压值的问题,学生在解这类问题往往感到困难。这类问题一般可分为两种,一是串联纯电阻用电器的最大值;二是串联电容器的耐压值计算。 一、串联纯电阻用电器的耐压值 例1.如图1所示,两个灯炮A(220V,lOOW)和B(220V,25W)串联后接在电路PQ段,为使两灯泡安全使用,电路PQ所加电压最大值为多少?电路PQ段所允许消耗的最大功率为多少?(假设灯炮电阻一定)。
When solving problems related to electricity, the problem of the withstand voltage value of tandem electrical appliances is often encountered. Students often find it difficult to solve such problems. This kind of problem can generally be divided into two kinds, one is the maximum value of the series pure resistance electrical appliance; The second is the series capacitor voltage value calculation. First, the series voltage resistance value of pure resistance appliances Example 1. As shown in Figure 1, two light bulbs A (220V, lOOW) and B (220V, 25W) in series after the circuit in the PQ segment, in order to make the two bulbs safe What is the maximum value of the voltage applied to the circuit PQ, and what is the maximum power that can be consumed in the PQ segment of the circuit (assuming a certain resistance of the lamp).