Originally Posted by mpaap

Resistance of R4 and R5 is 5 ohms, same with R1 and R2. i calculated whole resistance, and it's 11 ohms

So what is the current from the 44V supply?

Now work backwards:

V= IR

In parallel I1+ I2 + I3 = Itot

In series I is the same

In series U1 + U2 + U3 = U tot

In parallel U is the same

Originally Posted by mpaap

well, if the voltage is 44 and resistance is 11 then I = V / R so.. I = 44 / 11 = 4A
now what?

Good.

You know the value of R1 and R2 in parallel is 5R, so use ohms law to find the voltage drop across R1 and R2

Vdrop= 5ohms * 4Amps =.......

Originally Posted by mpaap

well now that's a part where im not so good in..
If Vdrop is 5ohms * 4A then it's 20V
so R12 = 20V ?
R1 = R2 = 10V ?

No, dont forget you have calculated the parallel value for R1 and R2

so its just 5 ohms,, as U1 =44V the the drop across R1 and R2 is 20V.

You now know the voltage across R6, which is 44-20 = 24V

so calculate the current thru R6.....?

Originally Posted by mpaap

now it's getting confuseing.
okei, R6 is 10 ohms and voltage is 24 ohms..
then i think I = 10 / 24 = 2,4A ?
am i right?

Good, thats correct.. 2.4A
So the next step is to work out the current thru R3 R4 and R5

You have already worked out that all together R3,4 and 5 are 15Ohms

so whats the current thru this 15 ohms, you know the voltage is 24V

I = 24V/15R =...... ?

okei, 24V / 15R = 1,6 ohms
so R345 = 1,6 ohms ?

o yes, my bad.. 1,6A ?

Originally Posted by mpaap

okei, 24V / 15R = 1,6 ohms
so R345 = 1,6 ohms ?

Its actually 1.6 Amps not ohms.

You are almost there!

You know now the current is 1.6Amp

so work out the voltage drop across the R3 resistor

Vdrop= 1.6A * 10R = ........ ?

Voltage drop across the R3 = 1.6A * 10R = 16V ?
that means R3 is 16V ?

So R4 = R5 = 4 V?

Originally Posted by mpaap

Voltage drop across the R3 = 1.6A * 10R = 16V ?
that means R3 is 16V ?

ok, just one more step and youre done.

Across R4 and R5 is 24V - 16V = 8V

so now work out the current thru R4..

I= 8V/10R =..... ?

The R5 is the same.!

Now fill in the question list and post it.

Originally Posted by mpaap

R4, i = 0.8 a?

Correct.

So now put the values you have calculated into that circuit diagram you first posted, lets see it.