20题 做对的给好评
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:物理作业 时间:2024/08/04 05:05:24
20题 做对的给好评
![](http://img.wesiedu.com/upload/1/18/1180fd0abf7189daa8fbea231626e371.jpg)
![](http://img.wesiedu.com/upload/1/18/1180fd0abf7189daa8fbea231626e371.jpg)
![20题 做对的给好评](/uploads/image/z/8209528-16-8.jpg?t=20%E9%A2%98+%E5%81%9A%E5%AF%B9%E7%9A%84%E7%BB%99%E5%A5%BD%E8%AF%84%26nbsp%3B)
(1):S合,S1断开,I=I2=0.1A,U=U2=3V
R2=U2/I2=3V/0.1A=30Ω
(2):S、S1合,I2仍为0.1A
I1=I'-I2=0.3A-0.1A=0.2A
U=U1=3V
R1=U1/I1=3V/0.2A=15Ω
P1=U1×I1=3V×0.2A=0.6W
R2=U2/I2=3V/0.1A=30Ω
(2):S、S1合,I2仍为0.1A
I1=I'-I2=0.3A-0.1A=0.2A
U=U1=3V
R1=U1/I1=3V/0.2A=15Ω
P1=U1×I1=3V×0.2A=0.6W