In order to determine the equivalent resistance of two resistors R1 and R2 connected in series, a student made this circuit for his experiment.
The only statement which is true for this circuit is that it gives:
(1) incorrect readings for current I as well as for potential difference V
(2) correct reading for current I but incorrect reading for potential difference V
(3) incorrect reading for current I but correct reading for potential difference V
(4) correct readings for both current I and potential difference V
In order to determine the equivalent resistance of two resistors R1 and R2 connected in series, a student made this circuit for his experiment.
The only statement which is true for this circuit is that it gives:
(1) incorrect readings for current I as well as for potential difference V
(2) correct reading for current I but incorrect reading for potential difference V
(3) incorrect reading for current I but correct reading for potential difference V
(4) correct readings for both current I and potential difference V
For determining the equivalent resistance of two resistors connected in series, the ammeter should be connected in series and the voltmeter should be connected in parallel to the resistors. As the current flow 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 voltmeter is not in parallel with R₁ and R₂. So incorrect reading will be for potential difference V but the ammeter is connected in series, hence the circuit will give the correct value of current I, but the incorrect value of potential difference V.
Hence, the correct answer is option 2.
For determining the equivalent resistance of two resistors connected in series, the ammeter should be connected in series and the voltmeter should be connected in parallel to the resistors. As the current flow 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 voltmeter is not in parallel with R₁ and R₂. So incorrect reading will be for potential difference V but the ammeter is connected in series, hence the circuit will give the correct value of current I, but the incorrect value of potential difference V.
Hence, the correct answer is option 2.
