1. The problem statement, all variables and given/known data In the circuit below the batteries have negligible internal resistance and the voltmeter V has a very high resistance. What would be the reading of the voltmeter? Answer: 9.6 V. 2. The attempt at a solution I used the Kirchhoff's rule: the current that flows from 10 V is I1, current that flows to the voltmeter is (I1 - I3) and the current that flows into the 8 V is I3. So I got 10 - 8 = 4 I3 + 1 I1 and 10 = RV (I1 - I3) + 1 I1. But this doesn't look like it can be solved. We have R which I don't what to do with it. Any ideas please?