Question

Four students have made the following circuit diagrams for determining the equivalent resistance of two resistors connected in series:



The correct circuit diagram is :
(1) A
(2) B
(3) C
(4) D

Answer 1

For determining the equivalent resistance of two resistors connected in series, the ammeter is connected in series and the voltmeter is connected in parallel to the resistors. As the current flows from high voltage to low voltage, hence the polarities of ammeter and voltmeter are also set according to the flow of current in the circuit.

Out of all given circuit, only circuit B is correct, as it has both ammeter and voltmeter connected at the right place and with right polarities.

Hence, the correct answer is option 2.