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设计型实验是近年来高考考查的热点,也是高三复习教学的重点之一;设计型实验主要以电路设计为主.电路设计经常要用到定值电阻,定值电阻如何使用往往是学生最感困惑的地方,也是教学的薄弱环节.鉴于此,笔者将定值电阻作为一个专题进行了研究,从而总结出了如下一些规律.一、定值电阻作为保护电阻使用定值电阻作为保护电阻,是定值电阻最常见的应用.这类问题的关键是弄清题目的设计原理,根据提供的数据进行必要的估算,确定好保护电阻在电路中的位置.例1利用下面适当的实验器材,设计一电路来测量电流表 A_1的内阻 r_1,要求方法简捷,有尽可能高的测量精度,
The design experiment is a hot spot in the college entrance examination in recent years, and it is also one of the focuses of the third grade review teaching. The design experiment is mainly based on the circuit design. The circuit design often uses a fixed value resistor. How to use the fixed value resistor is often the most sense for students. The puzzled place is also the weak link of teaching. In view of this, the author studied the fixed value resistor as a special topic, thus summed up the following rules. First, the fixed value resistor as a protective resistor uses a fixed value resistor as a protective resistor. The most common application of fixed-value resistors is to find out the design principle of the problem and make necessary evaluations based on the data provided to determine the position of the protection resistor in the circuit. Example 1 Designing with the following appropriate test equipment A circuit to measure the internal resistance r_1 of the current meter A_1 requires a simple method and has the highest possible measurement accuracy.