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应用电源电压不变,是解决电学问题的常用方法。它主要适用于由于电路中电阻的变化(如滑动变阻器的滑片滑动时)或电路连接情况发生变化(如通过开关闭合或断开,改变电路的连接情况),使电路出现两种或几种不同的情况。电源电压不变是连结不同情况的纽带。例1.如图1所示,一定值电阻R0与最大阻值为40Ω的滑动变阻器串联在电路中,闭合开关S,当滑动变阻器的滑片P滑到最左端时,电流表的示数为0.3A;当滑动变阻器的滑片P滑到最右
Application of the same power supply voltage, is the common method of solving electrical problems. It is mainly used in the circuit due to changes in resistance (such as sliding rheostat sliding slide) or changes in the circuit connection (such as through the closure of the switch or change the circuit connection), the circuit appears two or more Different situations. The same power supply voltage is the link connecting different situations. Example 1. Shown in Figure 1, a certain value of the resistor R0 and the maximum resistance of 40Ω sliding rheostat in series in the circuit, switch S is closed, when the sliding rheostat slide P to the left, the ammeter shows 0.3 A; slide vane slides to the right as sliding rheostat