Consider an RC discharging circuit with R = 4.0 kohms, C = 1.5 mF, and Vo = 9.0

Question

Consider an RC discharging circuit with R = 4.0 kohms, C = 1.5 mF, and Vo = 9.0 V. How long will it take to discharge the capacitor to 3.0 volts?
---- 4.4 s ---- 5.5 s ---- 3.3 s ---- 2.2 s ---- 1.1 s ---- 6.6 s
Choose from the list above Consider an RC discharging circuit with R = 4.0 kohms, C = 1.5 mF, and Vo = 9.0 V. How long will it take to discharge the capacitor to 3.0 volts?
---- 4.4 s ---- 5.5 s ---- 3.3 s ---- 2.2 s ---- 1.1 s ---- 6.6 s
Choose from the list above
---- 4.4 s ---- 5.5 s ---- 3.3 s ---- 2.2 s ---- 1.1 s ---- 6.6 s
Choose from the list above

Explanation / Answer

R = 4 K

C = 1.5 mF

Time constant , T = RC

T = 4*1.5 = 6 s

Now ,

V = Vo*e(-t/T)

3 = 9 *e(-t/6)

solving for t

t = 6.6 s

it will take 6.6 s for capacitor t dischagre

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