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Current Electricity: Ohm's law and resistance

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Part 1

A typical cell membrane is 7.86 nm thick and has an electrical resistivity of 1.28E+7 Ω*m. If the potential difference between the inner and outer surfaces of a cell membrane is 71.7 mV, how much current flows through a square area of membrane 1.16 μm on a side?

Part 2

Suppose the thickness of the membrane is quadrupled, but the resistivity and potential difference remain the same. How much current flows through the same area of membrane now?

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Solution Summary

Two problems on Ohm's law are solved.

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Cell Membranes
Part 1

A typical cell membrane is 7.86 nm thick and has an electrical resistivity of 1.28E+7 Ω*m. If the potential difference between the inner and outer surfaces of a cell membrane is ...

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