18.3 Resistance and Ohm’s law Resistance of a tungsten filamentExample 5 A student carried out an experiment to find the resistance of the tungsten filament.

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18.3 Resistance and Ohm’s law Resistance of a tungsten filamentExample 5 A student carried out an experiment to find the resistance of the tungsten filament of a bulb. He obtained the following results: Current through the filament I / A Voltage across the filament V / V (a) Plot a graph of V against I.

18.3 Resistance and Ohm’s law voltage / V current / A

18.3 Resistance and Ohm’s law No. The graph is a curve. Voltage is not directly proportional to the current. (b) (i) Find the resistance of the tungsten filament when the voltage is 4 V.  2.22  (b) (ii) Find the resistance of the tungsten filament when the voltage is 12 V.  4  (c) Does the tungsten filament obey Ohm’s law? Explain your answer.