The following comments apply to the circuit: a) When switch 1 (SW1) is closed in

Question

The following comments apply to the circuit:

a) When switch 1 (SW1) is closed in figure 1, C1 is charged.

b) When switch 2 (SW2) is closed in figure 1, C2 is charged.

c) When switch 3 (SW3) is closed in figure 1, C1 is discharged through the LED.

d) When switch 4 (SW4) is closed in figure 1, C2 is discharged through the LED.

e) In normal circuit operation, only one switch is closed at a time.

f) VTH and RTH shown in Figure 1 model your wall adapter.VTH = 12V

and RTH = 6 ohms.

3) Calculate T when switch 1 is closed (all other switches are open). Clearly show your

calculations and how you determined Vth and Rth for the resulting circuit. Draw the

Thevenin equivalent circuit.

Be careful

Explanation / Answer

when switch 1 is closed and switch 2 is open we have R2 open and then Rmete is parallel with c1 but at dc the capacitor is is open circuit so rmete Resistance is also negligible w.r.t capacitor's impedance. so we have R1 in series with the Rth and total T when switch 1 is closed and all the switches are open is T=(RTH +R1)(c1); similarly when switch 2 is closed and all other switches are open we have when switch 1 is closed and switch 2 is open we have R2 open and then Rmete is parallel with c2 but at dc the capacitor is is open circuit so rmete Resistance is also negligible w.r.t capacitor's impedance. so we have R2 in series with the Rth and total T when switch 1 is closed and all the switches are open is T=(RTH +R2)(c2);

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