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电路总电阻R总?R1?R2?R3?24?
U242R3消耗的功率P???2W
R38'30.(1) I?U10??0.5A
R1?R212?8(2) f1?0.2G1?2N
F?f1?f2?0.2G1?0.2(G1?G2)?8N
(3) I?U10?
R2?8?8x20?8x101?0.5,?2
20?0I1011x?0.2,I??,?1.84
20?1.61.84I1011x?0.4,I??,?1.68
20?3.21.68I1011x?0.6,I??,?1.52
20?4.81.52I1011x?0.8,I??,?1.36
20?6.41.36I1011x?1,I??,?1.2
20?81.2Ix?0,I?
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