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一、提出问题电学实验电路一般由电源、控制电路和测量电路三部分组成.其中控制电路的主要器件是滑动变阻器.滑动变阻器在电路中的接法一般有分压式接法和限流式接法两种,其作用是使测量电路中的电压与电流在合适的范围内变化,从而完成实验数据的测量.那么,滑动变阻器的阻值大小会对测量电路产生什么样的影响,我们如何根据实际情况来选择滑动变阻器呢?二、解决问题1.限流电路中滑动变阻器的选择滑动变阻器限流式接法电路如图1所示,负载电阻为R,滑动变阻器的总阻值为R_0,绕线部分的总长为l,电源电动势为E,内阻不计.调节滑片P的位置可连续改变AP之间的电阻值,从而使测量电路中的电流I随之变化,设AP之间的电阻长度为x.
First, ask questions Electric experiment circuit generally by the power supply, control circuit and measurement circuit is composed of three parts, of which the main components of the control circuit is a sliding rheostat sliding rheostat in the circuit connection generally have partial pressure connection and current-limiting connection France two kinds of its role is to make the measurement circuit voltage and current in the appropriate range of changes in order to complete the measurement of the experimental data.So the resistance of the sliding rheostat will measure the size of the circuit what kind of impact, Second, to solve the problem 1. Current limiting circuit in the choice of sliding rheostat sliding rheostat current limiting connection circuit shown in Figure 1, the load resistance R, the total resistance of the sliding rheostat R_0, The total length of the winding part is l, the electromotive force of the power supply is E, and the internal resistance is not counted.Adjusting the position of the sliding piece P can continuously change the resistance value between APs so as to change the current I in the measuring circuit, The resistor length is x.