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电压表和电流表是测量仪表,它们接入电路后并不影响电路结构,但接入电表后使电路结构看上去显得更复杂而难识别。其实电流表内阻很小而可以忽略不计,在电路中可用一段导线取代电流表;而电压表内阻很大,可认为没有电流通过它,在电路中可视为断路点,将电压表连同其接线直接取走不影响电路结构。这样处理后电路结构大为简化,涉及两表的电学题就会迎刃而解。
Voltmeters and ammeters are measuring instruments. They do not affect the circuit structure after they are connected to the circuit. However, the access to the meter makes the circuit structure appear more complicated and difficult to identify. Actually, the internal resistance of the ammeter is small and can be neglected. In the circuit, a wire can be used instead of the current meter; while the internal resistance of the voltmeter is very large, it can be considered that no current flows through it and can be regarded as a breaking point in the circuit, and the voltmeter together with its wiring Direct removal does not affect the circuit structure. After this kind of processing, the circuit structure is greatly simplified, and the electric problems involving two tables will be solved.