A rod of length 2.3 m, with a rectangular cross section (1.5mm x 3.0 mm) is made of a material with a resistivity of 6.1 × 10^-8 Ohm.  A potential difference of 5.0 V is places across the ends of the rod. a.  Draw a clear physics diagram of the problem. b.  At what initial rate is heat generated in the rod? c.  Will the rate from part (b) increase, decrease, or remain constant over time, as the rod remains connected to the 2.5 V potential difference? Explain briefly

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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.