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一、串联电路中的故障例1如图1所示,当S闭合后,两灯泡均不发光,电流表指针几乎不动,但电压表的指针有偏转,该电路的故障可能是A.电流表坏了或未接好B.灯L2的灯丝断了或灯座与灯泡未接好C.电流表和L1、L2都坏了D.从a点开始经L1到b的这段电路有断路分析“电压表的指针有偏转”说明电源正极至a点、b点至电源负极是通路,排除了A、B、C三个选项;再根据“电流表
First, the series circuit fault case 1 shown in Figure 1, when S is closed, the two bulbs are not light, the ammeter pointer almost does not move, but the voltmeter pointer deflection, the circuit failure may be A. ammeter bad Or did not pick good B. Lamp L2 filament is broken or the lamp holder and the bulb is not connected properly C. Ammeter and L1, L2 are broken D. From a point on this circuit through L1 to b circuit analysis ” Voltmeter pointer deflection “Description positive power supply to a point, b point to the negative power supply is the passage, ruled out A, B, C three options; then according to ” ammeter