As part of a class project you are given 0.900 g of nichrome and asked to fabricate a wire with uniform cross-section. You use up 95% of the nichrome and make a wire with a resistance of 0.793 Ω. The resistivity of nichrome is 1.00  10-6 Ω · m and its density is 8.31  103 kg/m3. a. What length of wire do you end up with? b. What is the diameter of the wire?

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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.