实验题作为考查实验能力的有效途径和重要手段,在高考试题中一直占有相当大的比重,而电学实验因其实验理论、步骤和完整性及与大学物理实验结合的紧密性,自然成为高考实验考查的重中之重,电阻测量成为高考考查的焦点,伏安法测电阻是电阻测量最基本的方法,伏安法测电阻常涉及电流表内、外接法的选择与滑动变阻器限流、分压式的选择。 Experimental questions as an effective way to test the ability of experiments and an important means in the entrance examination has been a large proportion of the total, and electrical experiments because of its experimental theory, procedures and integrity and the physical combination of university physics, the tight nature of the college entrance examination experiment The most important test, the resistance measurement becomes the focus of college entrance examination examination, voltammetry resistance is the most basic method of resistance measurement, voltammetry resistance often involves ammeter, the choice of external methods and rheostat rheostat flow, partial pressure Type of choice.