Question

Two students made two circuits A and B to determine the resultant resistance of two resistors R₁ and R₂ connected in series:



All the components have been connected correctly in:
(1) circuit A only
(2) circuit B only
(3) both circuits A and B
(4) neither of the two circuits

Answer 1

To determine the resultant resistance between two resistances, the voltmeter should be connected in parallel to both resistances and ammeter should be connected in series in the circuit. In circuit A, both the ammeter and voltmeter are connected correctly but in circuit B, the voltmeter is not connected in parallel across both resistances, so voltmeter is not connected correctly in circuit B.

Hence, the correct answer is option 1.