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Give any four precautions taken by a stu...

Give any four precautions taken by a student to perform an experiment to determine the resultant resistance of two resistors when connected in series.

Text Solution

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(i) Clean the ends of the connecting wires by sand paper.
(ii) The connections should be tight.
(iii) Close the key (K) only when readings are to be taken.
(iv) Zero errors and the ranges of the ammeter and voltmeter should be noted.
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The given circuit diagram shows the experimental arrangement of different circuit components for determination of equivalent resistance of two resistors connected in series. Identify the components X, Y and Z shown in the circuit respectively.

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Knowledge Check

  • The equivalent resistance of resistors connected in series is always

    A
    Equal to the mean of component resistors
    B
    Less than the lowest of component resistors
    C
    In between the lowest and the highest of component resistors
    D
    Equal to sum of component resistors

  • When the resistors are connected in series, then

    A
    current through each resistor is same as the total current in the circuit
    B
    voltage across each resistor is same as the total voltage in the circuit
    C
    the sum of the current passing through each resistor is same as the total current in the circuit
    D
    the effective resistance is less than the smallest of the Individual resistance

  • Choose the appropriate set of apparatus for performing the experiment to determine the equivalent resistance of two resistors when connected in series :

    A
    Voltmeter, Ammeter, Two resistors, Key, Battery
    B
    Ammeter, Two resistors, Key, Connecting wires, Rheostat, Battery
    C
    Key, Rheostat, Voltmeter, Two resistors, Battery, Connecting wires
    D
    Battery, Ammeter, Connecting wires, Rheostat Voltmeter, Two resistors, Key

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