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滑动变阻器是高中物理最常见最基本的电学器件之一,也是高考的重要考点。其工作原理是通过改变接入电路部分电阻线的长度来改变电阻,从而起到调节电流大小和两点间电压的作用。本文结合2013年天津物理高考典型试题题谈一谈滑动变阻器的两种使用方法。一、滑动变阻器的限流接法限流电路如图1所示,移动滑动变阻器的滑动片P可以改变连入电路中的阻值,从而控制负载R中的电流大小,图1中滑动片P滑至最左端时,连入电路中的电阻值为最大值,此时电流最小。因此,在一些具体电路中,在闭合电键前,
Slide rheostat is one of the most common high school physics most basic electrical devices, but also an important test center entrance. Its working principle is by changing the length of the access circuit part of the resistance to change the resistance, which play a role in regulating the current size and voltage between two points. This article combines the 2013 Tianjin Physical College Entrance Examination typical questions to talk about two kinds of use of sliding rheostat. First, the current limiting slip rheostat connection method as shown in Figure 1, the sliding sliding rheostat sliding piece P can be connected into the circuit to change the resistance, thereby controlling the size of the current in the load R, Figure Sliding piece P Slip to the leftmost end, connected to the circuit resistance value is the maximum, this time the minimum current. Therefore, in some specific circuits, before closing the key,