Measuring Voltage Across Two Points In A Series Circuit

1. The problem statement, all variables and given/known data

The series circuit is connected as follows: A 12V Battery -> 8ohm resistor -> 7V Battery -> 4ohm Resistor -> Earth. The problem states that if a voltmeter was connected from a point between the 12V battery & the 8ohm Resistor and connected to a point above the earth then what would be the voltage? I do not believe that the earth plays any part in this question. I’ve measured total EMF to be 19v, Total Resistance (R) 12V & the current (I) to be 1.6A

2. Relevant equations

V=IR
Rtotal = R1 + R2

3. The attempt at a solution

Measuring the voltage across Rtotal: V=IR = 1.6×12 = 19V – 7V (battery) = 12V
I know this is a simple question but it’s worth quite a few marks so want to be very precise. I’m just unsure how the 7v battery actually works with the resistors when using a voltmeter.

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