电路中电位的计算?

2009-9-24 12:03:44 4008

0 电路中电位的计算? 在电路中选择参考点，即零电位点。零电位点可以任意选择。电路的接地点就是零电位点，用符号“⊥”表示。电路中某点的电位：从该点出发，沿任选的一条路径“走”到参考点所经过的全部电位降的代数和： ? (1) 选择一个零电位点，即参考点。? (2) 标出电源和负载电压的极性： (3) 求点A的电位：选一条从A到零电位点的路径，从A出发沿此路径“走”到零电位点。沿AE1D路径：VA=E1? 沿ABD路径：VA=I1R1+I3R3+E3 沿ABCD路径：VA=I1R1+I2R2-E2 R1=5Ω,R2=10Ω，R3=15Ω,E1=180V，E2=80V。（1）B为参考点，求VA、VB、VC、VD ，并求C、D两点之间的电压；（2）若D为参考点求VA、VB、VC、VD和UCD。解：① I1+I2－I3=0 (节点A)? I1R1+I3R3=E1 (回路CABC)? I2R2+I3R3=E2 (回路DABD) 得:I1=12A,I2=－4A,I3=8A? ② 以B为参考点,则VB=0? VA=I3R3=120V?? VC=E1=180V?? VD=E2=80V?? UCD=VC-VD=100 V? ? ③ 以D为参考点,则VD=0? VA=-I2R2=40 V?? VB=-E2=-80V?? VC=I1R1-I2R2=100 V UCD=VC-VD=100 V 0 本帖子中包含更多资源您需要登录才可以下载或查看，没有帐号？注册 x
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