@JohnRennie Hi! What will happen if two voltmeters are connected in series?

Like this ^

Let me redraw this in a slightly different way ...

A ideal voltmeter has an infinite resistance.

A real voltmeter has a finite (but high) resistance.

Yes

So the circuit you drew is like mine where my resistances are the real resistances of the voltmeters, and my voltmeters are ideal ones with infinite resistance.

So the voltages depend on the resistances of the real voltmeters in the usual way. If they are all identical then V1 and V2 both measure half of what V3 measures.

Does this make sense?

Hmm

@JohnRennie Is potential difference across a voltmeter 0? As V=IR and I is zero. Or Does current flow through real resistance?

In a real voltmeter the resistance is high but not infinite and some current always flows. The voltage is then just V = IR, where R is the rsistance of the voltmeter and I is the current flowing through it.

Thanks :-)

:-)