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串、并联电路是最基本的电路连接方式。掌握串、并联电路的电阻关系是进行电路计算的基础。下面介绍几种巧解方法。 一、等效电路法 例1 三个电阻R_1为13欧、R_2为6.5欧、R_3为1.3欧并联,并联后的总电阻是( )。 (A)大于1欧 (B)小于1欧 (C)等于1欧 解析:把R_2看成是两个R_1并联的等效电阻,把R_3看成是10个R_1并联的等效电阻,这样R_1、R_2和R_3并联就等于13个R_1并联,所以,总电阻R=R_1/(13)=1欧。故应选(C)。
Serial and parallel circuits are the most basic circuit connections. Mastering the resistance relationship between series and parallel circuits is the basis for circuit calculations. The following describes several kinds of clever solutions. First, the equivalent circuit method Example 1 Three resistors R_1 is 13 euros, R_2 is 6.5 euros, R_3 is 1.3 euros in parallel, the total resistance after parallel connection is (). (A) More than 1 Euro (B) Less than 1 Euro (C) Equal to 1 Euro Resolution: Think of R_2 as the equivalent resistance of two R_1 shunts, and R_3 as the equivalent resistance of 10 R_1 shunts, such that R_1 The parallel connection of R_2 and R_3 is equal to 13 parallel connections of R_1, so the total resistance R=R_1/(13)=1 Ω. Therefore, it should be selected (C).