To find the resultant resistance of two resistors when connected in series, a student arranged the various components according to the circuit shown alongside:

The student, however, did not succeed in his objective. Which of the following mistake has been made by the student in setting up the circuit?
(1) position of voltmeter is wrong
(2) position of ammeter is wrong
(3) terminals of voltmeter are wrongly connected
(4) terminals of ammeter are wrongly connected

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Solution

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, so the polarities of ammeter and voltmeter are also set according to the flow of current in the circuit.

In the given circuit terminals of ammeter are wrongly connected as per the direction of flow of current in the circuit.
Hence, the correct answer is option 4.

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Similar questions

Q. A student sets up an electric circuit shown here for finding the equivalent resistance of two resistors in series:

In this circuit, the:
(1) resistors have been connected correctly but the voltmeter has been wrongly connected
(2) resistors have been connected correctly but the ammeter has been wrongly connected
(3) resistors, as well as the voltmeter, have been wrongly connected
(4) resistors, as well as the ammeter, have been wrongly connected

Q. To determine the equivalent resistance of two resistors when connected in series, a student arranged the circuit components as shown in the diagram. But he did not succeed to achieve the objective.
Which of the following mistakes has been committed by him in setting up the circuit?

For carrying out the experiment, on finding the equivalent resistance of two resistors connected in series, a student sets up the circuit as shown. On further verification, he finds out that the circuit has one or more of the following faults:

(i) The resistors R₁ and R₂ have not been correctly connected in series

(ii) The voltmeter has not been correctly connected in the circuit

(iii) The ammeter has not been correctly connected in the circuit

Out of these three, the actual fault in the circuit is/are:

Which statement is /are correct?
1. An ammeter is connected in series in a circuit and a voltmeter is connected in parallel.
2. An ammeter has a high resistance.
3. A voltmeter has a low resistance.

Q. To study the dependence of current (I) on the potential difference (V) across a resistor, the correct way of connecting the ammeter and voltmeter in the circuit is:
(1) ammeter and voltmeter both are connected in series
(2) ammeter is connected in parallel and voltmeter in series
(3) ammeter is connected in series and voltmeter in parallel
(4) ammeter and voltmeter both are connected in parallel

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