Cardiac defibrillator\'s are discussed in Section 17-9 of the textbook by Gianco

Question

Cardiac defibrillator's are discussed in Section 17-9 of the textbook by Giancoli. (a) Choose a value for the resistance so that the 1.0 micro Farad capacitor can be charges to 3000V in 2.0 seconds. Assume that this 3000 V is 95% of the full source voltage. (b) The effective resistance of human body can be taken as 10(^4) ohm. if the defibrillator discharges with a time constant of 10ms, what is the effective capacitance of the human body. Chose a value for resistance to show me the example to work it! Thank you!

Explanation / Answer

a) 0.95 = ( 1- e^-t/ RC)

0.05 = e^ ( -2/ Rx 10^-6)

3= ( 2x10^6/ R)

R = 9.98 x 10^5 ohms apprx

b) time consatnt = RC

10 x 10^-3 = 10^4 C

C = 0.01 F

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