The voltage across a capacitor during charging:

$\overline{){\mathbf{V}}{\mathbf{=}}{{\mathbf{V}}}_{{\mathbf{0}}}{\mathbf{(}}{\mathbf{1}}{\mathbf{}}{\mathbf{-}}{\mathbf{}}{{\mathbf{e}}}^{\mathbf{(}\mathbf{-}\mathbf{t}\mathbf{/}\mathbf{R}\mathbf{C}\mathbf{)}}}$

Time for one beat, t = 60 s/72 = 0.8333 s

C = 40.0 nF(10^{-9}F/1nF) = 40.0 × 10^{-9} F

V_{0} is the charging voltage.

A heart pacemaker fires 72 times a minute. Each time a 40.0-nF capacitor is charged (by a battery in series with a resistor) to 0.632 of its full voltage. What is the value of the resistance?

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