Suppose that the resistance between the walls of a biological cell is 4.9 × 10^9 ohms (a) What is the current when the potential difference between the walls is 68 mV? (b) If the current is composed of Na+ ions (q = +e), how many such ions flow in 0.45 s?

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  1. R=4.9•10⁹ Ω
    I=V/R=68•10⁻³/4.9•10⁹=1.39•10⁻¹¹ A
    I=q/t =Ne/t

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