Finding the Reading on a Voltmeter with Internal Resistance in a Circuit

The voltmeter reading observed in a circuit is evaluated in this question with resistors connected in series and the voltmeter having an internal resistance.
The video is an extract from the Physics Exam Prep on the Detailed Solution to all the Theory Paper from WAEC WASSCE GCE 2018 Aug/Sept PC2 Physics Exam.
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[kopikofootpuma]

Still saving us, even two years later. Thanks man

[madhaverat]

Bro you are a legend! Saved me with an IB question!

[divyanshusharma]

This question (value were different) came in JEE MAINS 2020 september, INDIA :)

[sethkarr]

Instead of transposing so much you can use the equation 1 / (1/r1)+(1/r2) to get your parallel resistance

[chrish.]

Thank you very much! Helped with my IB Physics Homework in the US.

[bhatnaveed_]

Sir there resistors are in series not in parallel because there ends are connected to each other

[Michelle-sseq]

Thank you so much! This video just saved me in class :)

[anaSyRiAnFrEe]

Hello, could you help me out what if I wanted to find the reading on ampermetre with an amper source too
with the same analogy can you explain I need to find the reading of the ampermeter with internal resistance

[guy]

What do I do if I want to find the resistance of the voltmeter?

[kagosaudu]

His working is wrong because he found total resistance of a series circuit using a method you use to find total resistance in a parallel circuit

[nellvincervantes]

I thought resistance on voltmeter is infinite so that no current will flow through it?

It should be
1/R|| = 1/R1 + 1/infinite
1/R|| = 1/R1 + 0
1/R|| = 1/R1
R|| = R1

R(total) = R1 + R2
I(total) = V(total)/R(total)

Voltmeter reading = I(total)*R1