Practice portal › Current Electricity › Kirchhoff's Laws and Circuit Analysis
Asked in GUJCET 2011 · Ammeters and voltmeters in circuits
Idea: a voltmeter is connected in parallel across the two points whose potential difference it measures.
To leave that potential difference undisturbed, it must draw no current from the circuit.
A meter draws zero current at any voltage only if its resistance is infinite: I = V/(R_V)→0 as R_V→∞.
So the resistance of an ideal voltmeter is infinite.
Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.
Practise this with a timer