The voltage in typical household wiring is 120 Volt. A 100 Watt light bulb therefore draws a current of 0.83 Amp when connected. If the filament of the light bulb has a diameter of 0.065 millimeter,
obtain what is the current density in the filament?
___________ A/m2 (in the direction of the current)
Find the ratio of this current density to that in a 12-guagewire (diameter 0.21 centimeter) supplying current to the light bulb?
___________(Jfilament /Jwire)