如题所述
解ï¼å°çµæµI3æå¨çæ¯è·¯R3ä»çµè·¯ä¸æå¼ï¼ä¸å¾ã
I=ï¼Us1-Us2ï¼/ï¼R1+R2ï¼ã
Uoc=UAB=IR2+Us2ã
å°çµåæºçè·¯ï¼ä»AãB端çè¿å»ççæçµé»ä¸ºï¼
Req=RAB=R1â¥R2ã
æ´ç»´åå®çï¼I3=Uoc/ï¼Req+R3ï¼ã
1)开路电压 Uoc
Uoc = Uab = Us1 - R1*I1 = Us2 - R2*I2;
其中 I1 = -I2;
2)等效电阻 Rs
Rs = R1//R2;
则戴维南等效电路为 Uoc与Rs的串联;
所以: I3 = Uoc/(Rs+R3);