(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I want so show that U1=U*R2/(R1+R2) (sorry latex didn't work for me right now, don't know why)

2. Relevant equations

3. The attempt at a solution

I know the solution but I don't understand one step:

The solution says the following: the fall of voltage at U1 = R2*I (I is the current which comes from U). Why is that? Thats doesn't make sense to me, because I thought the current "splits" at this spot so I have: I=I1+I2.

Why does the solution say it's U=R2*I

Thanks for the help

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# Current circuit

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