The filament in an incandescent light bulb is made from tungsten (resistivity 5.6 x 10 Q-m). The light bulb is plugged into a 120-V outlet and draws a current of 2.46 A. If the radius of the tungsten wire is 0.00404 mm, how long must the wire be? Number i Units

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.