Figure 3 shows the voltage across a capacitor versus time in a RC-circuit experi

Question

Figure 3 shows the voltage across a capacitor versus time in a RC-circuit experiment (5) The applied voltage to the capi6 V. What is the estimated time constant for this capacitor? A) 1-50s B) 50-100s C) 100-150s D) 200-250 D)300-350s Figure 3: Voltage versus time for a capacitor Figure 3 shows voltage versus time for a discharging capacitor. (1s oosing the Exponential fit option in Excel: y74xp(ax) gives the result:-0.0085 and yo-3.05 15 25 15 + 00 03000 Figure 3: Voltage versus time for a discharging capacitor 1) What is the time constant of this RC-Circuit a) 118s b)63s c) 333s d) 289s n)What time will it take to discharge the capacitor completely if resistance in the circuit made zero (Chose the best answer) a) 0s b) 300s c) infinite d578s

Explanation / Answer

2.

from the Voltage -time graph, the Voltage is maximum during the period of 300-350 sec

so correct choice is D

3.

Y = Yo e-ax

for discharging capacitor, we have the equation as

V = Vo e-t/T

1)

comparing the equations

1/T = a

T = 1/a = 1/0.0085 = 117.65 sec

2)

infinite

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