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故障1闭合开关后,灯泡不亮,电流表、电压表也无示数。分析判断:可以断定电路是开路,但不知断在哪里,可能是:(1)电源、电流表、开关或滑动变阻器损坏。(2)接线柱接触不良。(3)连接导线断了。排除方法:可用电压表检测电路中的不同部分两端是否有电压:先查电源,若电源电压比正常值小得多,说明电源没电,应更换电池;若电源正常,则用电压表测得哪部分两端有电压,哪开路。
Fault 1 When the switch is closed, the light bulb does not light, and the ammeter and voltmeter have no indication. Analysis and judgment: It can be concluded that the circuit is open circuit, but I do not know where it is broken, it may be: (1) The power supply, ammeter, switch or sliding rheostat is damaged. (2) Poor contact of the terminal. (3) The connection wire is broken. Remedy: Use a voltmeter to check if there are voltages across the different parts of the circuit: Check the power supply first. If the power supply voltage is much smaller than the normal value, it indicates that the power supply is dead, replace the battery; if the power supply is normal, use a voltmeter to measure Which part of both ends have voltage, which open circuit.