Problem: 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?

FREE Expert Solution

The voltage across a capacitor during charging:

V=V0(1 - e(-t/RC)

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

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

V0 is the charging voltage.

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Problem Details
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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