The filament in an incandescent lightbulb is made from tungsten, the resistivity of tungsten is 5.6×10 ^-8 qm. The radius wire is 0.045 mm. If the bulbs to be plugged into 120 V outlet and is to draw a current of 1.24 A (
how long must the wire be?
1 - determine resisance ?
2- cross-sectional area of the wire?
3- length of the wire?