School of Electrical Engineering & Automation, Anhui University,电 路 理 论 习 题,School of Electrical Engineering & Automation, Anhui University,第三章3-13题(a) 用回路电流法求Ux,增补方程：,作业中的问题： 直接列写标准形式的回路(网孔)电流方程，而不是KVL方程。,School of Electrical Engineering & Automation, Anhui University,第三章3-19题(a) 用结点电压法求各支路电流,注意：与3A电流源串联的2电阻不计入自电导中！,School of Electrical Engineering & Automation, Anhui University,第三章3-21题 用结点电压法求电压U,School of Electrical Engineering & Automation, Anhui University,第五章5-1题 已知uo=-3u1-0.2u2，求R1和R2,School of Electrical Engineering & Automation, Anhui University,第五章5-3题 求图示电路的输出电压与输入电压之比u2/u1,School of Electrical Engineering & Automation, Anhui University,第五章5-4题 求图示电路的电压比值uo/u1,School of Electrical Engineering & Automation, Anhui University,第四章4-4题(a) 用叠加定理求电压u2,2V电压源单独作用时：,3A电流源单独作用时：,故原电路中的电压：,School of Electrical Engineering & Automation, Anhui University,第四章4-8题,所以当开关S在位置3时：,2,2,School of Electrical Engineering & Automation, Anhui University,第四章4-17题 RL等于何值时可吸收最大功率?求此功率。,求uoc：,求Req：,由最大功率传输定理知 ： RL=Req=4时其上获得最大功率，最大功率为：,School of Electrical Engineering & Automation, Anhui University,第四章4-19题 图(a)中，已知U2=6V，求图(b)中U1,解法一：,把R1、R2和N网络归为N网络中，N网络仍为纯电阻网络，独立源置零后电路拓扑结构不变，为互易网络，根据互易定理：,School of Electrical Engineering & Automation, Anhui University,根据特勒根定理2：,由题意知：,解法二：,代入数据，有：,