A tungsten wire has a radius of 0.098 mm and is heated from 20.0 to 1333 oC. The temperature coefficient of resistivity is α = 4.5 × 10-3 (Co)-1. When 170 V is applied across the ends of the hot wire, a current of 1.9 A is produced. How long is the wire? Neglect any effects due to thermal expansion of the wire. I will rate. solve correctly.

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Q: please redo.

A: Length of the rod

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.