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电学实验一向是高考物理的热点和难点,这部分知识学生最怕的是电路设计,在考查学生电路设计的实验中,如果备选器材含有定值电阻,就说明该定值电阻极有可能是有用的,有时甚至不能不用,那么怎样使用定值电阻?本文将通过几个经典考题说明定值电阻在实验电路中扮演的角色及所起的作用.一、定值电阻R0作为电路的保护电阻例1现测量一段铜芯导线的电阻率,用米尺测出其长度为L,用螺旋测微器测得其直径为D,用多用电表测得其电阻值
Electrical experiment has always been a hot and difficult college entrance examination physics, the most afraid of this part of knowledge students circuit design, test students in circuit design experiments, if the alternative equipment contains a fixed value of resistance, indicating that the resistance is most likely to be Useful, and sometimes can not even use, then how to use the value of resistance? This article will explain the role of the value of the resistance in the experimental circuit through several classic test questions and the role played by a. R0 as the value of the circuit protection resistor Example 1 Now measure the resistivity of a copper wire, measured with a meter length of L, measured with a screw micrometer diameter D, with a multimeter to measure the resistance value