I have problems calculating voltage and current in AC circuits.

The circuits:

http://img238.echo.cx/img238/5515/ac0sl.gifCan someone verify and tell me if this is correct? I am pretty shure about circuit 1 and 2, but not the third circuit.

My calculations for circuit:

1a.

f=159Hz

Xc=1/wc=10010ohm

I=sqrt(R^2+Xc^2) sqrt(10000^2+10010^2)=3,53*10^-4A

UR=I*R 3,53*10^-4*10000=3,53V

UC=I*1/wc 3,53*10^-4*10010=3,53V

U=sqrt(UC^2+UR^2)=5V

2a.

f=159Hz

Xc=10010ohm

I1=U/R 5/10000=5*10^-4A

I2=U/R 5/10010=5*10^-4A

I=I1+I2=10^-3A

3a.

f=159Hz

Xc=10010ohm

Replace the two resistors with: 1/10000+1/10000=1/ans=5000ohm

I=U/sqrt(R^2+(1/wc)^2) 5/sqrt(5000^2+10010^2)=4,47*10^-4A

U=I*R 4,47*10^-4*5000=2,235V

IR1=U/R 2,235/10000= 2,235*10^-4A

IC=U/(1/wc) 2,235/10010=2,23*10^-4A

Thanks in advance!