If the reading of the Ideal voltmeter (V) in the given circuit is 6V, then find the reading of the ammeter (A).

We are given with potential difference across 15 ohm resistor and we have to calculate the amount of current flowing in the circuit which will be the reading of ammeter.

Let the potential difference across 15 ohm resistor be V and the current flowing in the circuit be I. As we are given that the voltmeter is ideal which means that no current or very less current passes through it and hence nearly all the current passes through the 15 ohm resistor.

V = 6 V , R = 15 ohm , by using Ohm’s law , we get

V = I× R , ,

Always remember current passing through ideal voltmeter is always zero , Mathematically

I = 0 A, through an ideal voltmeter.