Here is the video I am watching:
For the current just after the 40 ohm resistor in parallel, he gets it to be 10 ohms, and his explanation is that it is 10 ohms because the total 20A current splits evenly between two resistors of two equal resistances, which I agree with.
However, when I use maths to get the answer, using I=V/R, I=12V/40ohms=0.3A , which is wrong, because the total circuit current is only 0.2A.
Why am I going wrong when doing maths to find the answer? My teachers explanations for resistors in parallel used the same method I have used, and this website has used:
http://physics.bu.edu/py106/notes/Circuits.html (I have attached an image of this method to this post too).
Please can you tell me where I am going wrong with the maths? I don't get it.