Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.4 µm × 1.4 µm in area. A measurement of the potential difference across the inner and outer surfaces of the membrane gives a reading of 83.3 mV. The resistivity of the membrane material is 1.30 x 107 Ω · m. (a) Determine the amount of current that flows through this portion of the membrane.  (Answer in A) (b) By what factor does the current change if the side dimensions of the membrane portion is doubled? The other values do not change. a) decrease by a factor of 4 b) increase by a factor of 2     c) decrease by a factor of 2 d) increase by a factor of 8 e) increase by a factor of 4

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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.