Circuit Theorems and Conversions

What is the Thevenin equivalent (V_TH and R_TH) for the circuit given?

A 6.4 V, 422

B 6.4 V, 560

C 6.4 V, 680

D 30 V, 422

ANS:A - 6.4 V, 422

Rth = R1||R2 + R3||R4 = 422.
Vth = Va-Vb.
Va = R2/(R1+R2)*Vs = 22.666.
Vb = R4/(R3+R4)*Vs = 16.31.
Vth = 6.356 V.

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