A tungsten wire has a radius of 0 075 mm and is heated from 20 0 to 1320 C The temperature coefficient of resistivity is 4 5 10 3 (C) 1 When 120 V is applied across the ends of the hot wire, a current of 1 5 A is produced How long is the wire Neglect any effects due to thermal expansion of the wire...

The resistance R of the wire depends on its length L so we can use Equation 203 to ex ...

A tungsten wire has a radius of 0.075 mm and is heated from 20.0 to 1320 C.

Question:

A tungsten wire has a radius of 0.075 mm and is heated from 20.0 to 1320 °C. The temperature coefficient of resistivity is α = 4.5 × 10-3 (C°)-1. When 120 V is applied across the ends of the hot wire, a current of 1.5 A is produced. How long is the wire? Neglect any effects due to thermal expansion of the wire.