A standard 100 (120 ) lightbulb contains a 7.80 -long tungsten filament. The high-temperature resistivity of tungsten is . What is the diameter of the filament? A 3.4--diameter wire carries a 20 current when the electric field is 5.1×10?2 . What is the wire's resistivity? The terminals of a 0.300 watch battery are connected by a 120 gold wire with a diameter of 0.100 . What is the current in the wire? The resistance of a very fine aluminum wire with a 17 17 square cross section is 1100 . A 1100 resistor is made by wrapping this wire in a spiral around a 2.7--diameter glass core. How many turns of wire are needed? A typical American family uses 700 of electricity a month. What is the average current in the 120 power line to the house? On average, what is the resistance of a household?