Find currents in this electrical circuit.

DISCLAIMER: I don't want the answer, I just want to know if I've formulated these equations correctly.

Hi, my task is to find the currents in each loop of the following circuit, using Kirchhoff's first law and Ohm's law.



I've decided to just apply Kirchhoff's law for each loop:


loop 1: 50(i1 - i2) + 30(i1 - i3) = 240V
loop 2: 50(i2 - i1) + 15i2 + 10(i2 - i3) + 25(i2 - i4) = 0V
loop 3: 30(i3 - i1) + 10(i3 - i2) + 20(i3 - i4) + 5i = 0V
loop 4: 25(i4 - i3) + (10 + 30 + 15)i4 + 20(i4 - i3) = 0V.

Are those equations correct? I don't want the answers to the equations, I just want to know if I've correctly formulated them.