测量电压的仪表叫电压表,用符号表示,电压表测量电压时必须并联在电路中.对于电压表的并联接法,许多同学感到无从下手,出错较多.对于并联,我们可以用分步的方法,化繁为简,降低难度.现举例加以说明:(一)用电压表测电源电压:Ⅰ.将表放在电源的下方(如图a).Ⅱ. 表正负接线柱引 The instrument for measuring voltage is called voltmeter and it is symbolized. When voltmeter is used to measure voltage, it must be connected in parallel with the circuit. For the connection method of voltmeter, many students feel that they can’t start and have many mistakes. For parallel connection, we can use step-by-step. The method is simplified and the difficulty is reduced. Now an example is given to illustrate: (a) Measure the power supply voltage with a voltmeter: I. Place the meter on the bottom of the power supply (Figure a). II.