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15/07/2021 2:47 pm
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(a) What is meant by the “resistance of a conductor”? Write the relation between resistance, potential difference and current.
(b) When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.
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15/07/2021 2:57 pm
(a) The property of a conductor due to which it opposes the flow of current through it is called resistance of the conductor.
Work done = Potential difference x charge moved.
(b) V = 12 volt, I = 2.5 x 10-3 A
We know that
V = IR
R = V/I
R = 12/(2.5 x 10-3)
R = 4.8 x 103 ohm
= 4800 ohm.