电路真题讲解

①LC并联谐振时ω 2 = 1/LC，电容c = 1/Lω2 = 1/25(10-3)(10 3)2 = 4。

②LC并联谐振支路对外开路，电路为纯电阻电路。总电流I = IR = 120/100 = 1.2A，R2两端电压U = 1.2× 50 = 60V，电感电流IL = U/ω L = 60/(65438。