Question

In the circuit shown the reading of voltmeter is 20v . calculate resistance of voltmeter . what will be the reading of voltmeter if this is put across 200ohm resistance

Answer 1

volt = resistance x current
V = R X I
V/I = R
20/I = R

V = RI
V = 200 I ,volts

Answer 2

Resistance=20/I

And

V = 200 I volts..

Hope you understand. :)