(1) I=U/R=(2.8-2)/R =0.1A R=8欧
(2) R1/R2 = U1/U2 =2/1
I1/I2= 1/2 I=1.5A
I1=0.5A I2=1A
R1=U1/I1=9V/0.5A=18欧
R2=U2/I2=9V/1A=9欧
注:仔细省题
(1) I=U/R=(2.8-2)/R =0.1A R=8欧
(2) R1/R2 = U1/U2 =2/1
I1/I2= 1/2 I=1.5A
I1=0.5A I2=1A
R1=U1/I1=9V/0.5A=18欧
R2=U2/I2=9V/1A=9欧
注:仔细省题