Consider current passing through a rectangular resistor (below) in two scenarios: along the length of the resistor (A) and across the width of the resistor (B).  The dimensions of the resistor are: length (R = 10 cm); width (R’ = 5 cm), and height (h = 2 cm).  The resistivity of the rectangular resistor is constant throughout. Which of the following statements are true? Choose the best answer. a. The resistance in (A) is 4x the resistance in (B) b. The resistance in (A) is 2x the resistance in (B) c. The resistance in (A) is ½ the resistance in (B) d. The resistance in (A) is ¼ the resistance in (B) e. The resistances in (A) and (B) are equal

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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.