A long wire with a radius of 0.400 cm carries a current. The potential difference across a 3.40 m long section of this wire is 15.0 V, and the wire carries a current of 0.450 A. (a) What is the resistance (in Ω) of the 3.40 m long section of wire? Ω (b) What is the resistivity (in Ω · m) of the wire? Ω· m

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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.