Question

Experiment: To study the dependence of current (I) on the potential difference (V) across a resistor and determine its resistance
Aim : To study the dependence of current ) on the potential difference (V) across a resistor and determine Its resistance. Requirements : A Nichrome resistor, a rheostat, dry cells, a plug key, a voltmeter. an ammeter. connecting wires and a sand paper. Procedure:
(1) Select a voltmeter and an ammeter of proper range and note their zero error and least count.
(2) Connect the circuit as shown in Fig, ta) with connecting wires. Keep the plug key open. [Scrub the ends of the connecting wires with a sand paper.] Show the connections to the teacher/examiner.
(3) Close the circuit by inserting the key in the plug. Adjust the rheostat by sliding the variable terminal till desirable reading is obtained in the ammeter.
(4) Note the readings of the voltmeter and ammeter and open the circuit by removing the plug from the key.
(5) In place of a single cell, connect two cells in series in the circuit to increase the potential difference.
(6) Close the plug key to complete the circult. Note the readings of the ammeter and the voltmeter.
(7) Take three more readings by increasing the number of cells.
(8) Keep the plug key open after taking all readings.
(9) In each case, find the ratio of the potential difference (V) across the resistor to the current (I) through the resistor.
(10) Plot a graph of potential difference V vs. current I.
(11) Disconnect the circuit before leaving the laboratory.











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Answer 1

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