直流电路中用得最多的仪表是电流表和电压表,特别是近几年高考对电流表和电压表的要求越来越高,因此认识和了解电流表和电压表是非常重要的.理想的电流表内阻很小,可以忽略不计,接入电路时可认为短路;理想的电压表内阻无限大,接入电路时可认为断路.实际中常用的电流表和电压表 The most frequently used instruments in DC circuits are ammeters and voltmeters. Especially in recent years, the requirements for ammeters and voltmeters have become higher and higher in the college entrance examination. Therefore, it is very important to understand and understand ammeters and voltmeters. The ideal ammeter resistance Very small, negligible, can be considered short circuit when accessing the circuit; ideal internal resistance of the voltmeter is infinite, can be considered when the circuit is open circuit. Actual commonly used ammeter and voltmeter