(a) Determine the resistance of a lightbulb marked 100 W @ 120 V.
(b) Assuming that the filament is tungsten and has a cross-sectional area of 0.010 mm2, determine the length of the wire inside the bulb when the bulb is operating.
(c) Why do you think the wire inside the bulb is tightly coiled?
(d) If the temperature of the tungsten wire is 2 600°C when the bulb is operating, what is the length of the wire after the bulb is turned off and has cooled to 20°C?