第1å¾ R1 R2ï¼ï¼ï¼
2.21
1) uo=4/20k x 10/40 x20k = 1vã
2) uo=4 x (10+20//20)/[20+(10+20//20)] =2vã
3) å å å®ç uo=1)+2)=1+2=3vã
2.1.4
设R1æçµæµ i'åä¸ï¼i+4u=7+i'...........(1)
2i=uï¼6i'=-uï¼2i=-6i'ï¼i'=-i/3ï¼
代å
¥(1) i+8i=7-i/3
28i/3=7ï¼i=3/4 Aï¼u=6/4=1.5vã
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