To measure the potential difference, an ammeter should always be linked in series with resistors, while a voltmeter should be connected in parallel with the resistor, as illustrated in the diagram below.

The ammeter and voltmeter readings may be obtained using Ohm’s Law.

The circuit has a total resistance of 5 + 8 + 12 = 25.

Because we know that the circuit’s potential difference is 6 V, we can calculate the current flowing through the circuit or via the resistors as follows:

6/25 = 0.24A = I = V/R

Allow V1 to represent the potential difference across the 12 resistor.

V1 may be computed using the current obtained as follows:

V1 = 0.24A

As a result, the ammeter will show 0.24 A and the voltmeter will read 2.88 V.