Choose the appropriate set of apparatus for performing the experiment to determine the equivalent resistance of two resistors when connected in series:
(1) Voltmeter, Ammeter, Two resistors, Key, Battery
(2) Ammeter, Two resistors, Key, Connecting wires, Rheostat, Battery
(3) Key, Rheostat, Voltmeter, Two resistors, Battery, Connecting wires
(4) Battery, Ammeter, Connecting wires, Rheostat, Voltmeter, Two resistors, Key

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Solution

For performing the experiment to determine the equivalent resistance of two resistors when connected in series, one would need Ammeter to measure the current, Voltmeter to measure the voltage drop across the resistors, connecting wire to make the connections, a battery to give power supply to the whole circuit, two resistors, a key to make the circuit open or close and a rheostat to control the amount of current flowing in the circuit by controlling the variable resistance in the circuit.

Hence, the correct answer is option 4.

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Similar questions

Q. Arrange the following steps to verify the Ohm's law in proper sequence.
(a) Switch on the electric circuit.
(b) Move the position of the slider of the rheostat and note down the ammeter and voltmeter readings.
(c) Connect ammeter, key, battery, rheostat and resistor in series by using conducting wires.
(d) Note down the Ammeter and voltmeter reading.
(e) Connect a voltmeter across the resistor.
(f) Determine the ratio of voltmeter reading and ammeter reading in each case.
(g) Note that the ratio of voltmeter and ammeter reading are equal in each case.

Q. You are given three resistors of 10 Ω, 10 Ω and 20 Ω, a battery of emf 2.5 V, a key, an ammeter and a voltmeter. Draw a circuit diagram showing the correct connections of all given components such that the voltmeter connected across the ends of 20 Ω resistor gives a reading of 2.0 V.

Q. The science laboratory in a school has the following apparatus available in it:

Battery	:	6 V
Rheostat	:	Varies battery voltage from 0 to 6 V
Resistors	:	3 Ω and 6 Ω
Ammeters	:	A₁ of range 0 to 5 A; Least count 0.25 A
	:	A₂ of range 0 to 3 A; Least count 0.1 A
Voltmeters	:	V₁ of range 0 to 10 V; Least count 0.5 V
	:	V₂ of range 0 to 5 V; Least count 0.1 V

For the experiment to determine the equivalent resistance of the two given resistors connected in parallel, the best combination would be:
(1) ammeter A₁ and voltmeter V₂
(2) ammeter A₂ and voltmeter V₁
(3) ammeter A₁ and voltmeter V₁
(4) ammeter A₂ and voltmeter V₂

Q. The following apparatus is available in the school laboratory:

Battery	:	4.5 V
Rheostat	:	Varies battery voltage from 0 to 4.5 V
Resistors	:	1 Ω and 2 Ω
Ammeters	:	A₁ of range 0 to 1 A; Least count 0.05 A
	:	A₂ of range 0 to 3 A; Least count 0.1 A
Voltmeters	:	V₁ of range 0 to 5 V; Least count 0.1 V
	:	V₂ of range 0 to 10 V; Least count 0.5 V

The best combination of ammeter and voltmeter for finding the resultant resistance of the two given resistors connected in series would be:
(1) ammeter A₁ and voltmeter V₁
(2) ammeter A₁ and voltmeter V₁
(3) ammeter A₂ and voltmeter V₁
(4) ammeter A₂ and voltmeter V₂

The ammeter, voltmeter and, resistors R₁ and R₂ connected in the circuit as shown below have been checked and found to be correct.

On plugging the key, the voltmeter reads 4.5 V but the ammeter reads 1.5 A. This is most likely because the wires joined to:

(1) resistor R₁ and loose
(2) resistor R₂are loose
(3) both the resistors R₁ and R₁ are loose
(4) ammeter terminals are loose

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