A certain lightbulb filament when hot has a resistance of, Ask an Expert

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A certain lightbulb filament when hot has a resistance of 205 ?. The potential difference across the filament at a certain instant is standard household voltage, 120 V.

(a) What current is flowing through the bulb at that time?

(b) If the filament of the bulb is a tungsten wire having a radius of 475 ?m, what is the magnitude of the current density in the filament?

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