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判断电路故障有一定难度,若用“断开顺移法”,问题便较易解决.这种方法是先断开电压表与导线的连接点,把电压表的接线头看成滑动触头,可顺导线移动,最后移到某部分电路两端或某点.其规则:(1)若电路是断路,无电流,则滑动触头,不能通过电源和断开处;可经过电阻、开关、电流表.(2)若电路是通路,有电流,则滑动触头,不能移过电源、电阻;可经过开关、电流表(注意:可把电流表视为导线,电压表视为开关断开).
Judging the circuit fault is difficult. If you use the “off-sweep method”, the problem is easier to solve. This method is to disconnect the connection point between the voltmeter and the wire, and the wiring head of the voltmeter is considered as a sliding contact. Can move along the wire, and finally moved to some part of the circuit at both ends or at a certain point. Its rules: (1) If the circuit is open circuit, no current, then slide the contact, can not pass through the power and disconnection; through the resistor, switch, Ammeter (2) If the circuit is a path, there is current, then the slider, can not move through the power supply, resistance; can go through the switch, ammeter (Note: The ammeter can be seen as a wire, voltage meter as a switch disconnect).