Problem 6t Suppose you wanted to charge final voltage. Randomized Variables C- 1

Question

Problem 6t Suppose you wanted to charge final voltage. Randomized Variables C- 115 pF n initially uncharged 115 pF capacitor through a 75 .ressor to 900% of its How much time (in s) would be required to do this? Numerie :A numeric value is expected and not an expression. CoelS Problem 7. Suppose you wanted to to discharge a 450 F capacitor through a 250 resistor down to 100% ofits orignal voltage Randomized Variables C = 450 F How pected and not an expression as an RC time constant of 9.5 ms due to the resistance of the patient's Problens: A heart defibnilator being body and the

Explanation / Answer

1.

TIme Constant

T=RC =(75*106)(115*10-12) =8.625 ms

In a RC circuit voltage as a function of time is given by

V=Vo(1-e-t/T)

0.9 =(1-e-t/8.625*10^-3)

Ln(0.1) =-t/8.625*10-3

t=0.01986 or 198.6 ms

2.

Time Constant

T=RC=250*450*10-6=0.1125 s

In a RC circuit Voltage as a function of time for discharging is given by

V=Voe-t/T

0.01=e-t/0.1125

Ln(0.01)=-t/0.1125

t=0.518 s

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