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For the circuit shown below the Thevenin's voltage and equivalent resistance at terminal ab are respectively:

For the circuit shown below the Thevenin's voltage and equivalent resistance at terminal ab are respectively: Correct Answer -8 V, 12 <span style="">Ω</span>

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Thevenin voltage(Vth)

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Let's say current i flows through the voltage source 10 V

Applying KVL in loop ⊥ 

10 = 10 i + 40(i - 2)

Solving we get i = 1.8 A

Vab = Vth = 40(i - 2) = -8 V

Thevenin Resistance (Rth)

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For Rth; SC voltage source and OC current source

Rab = Rth = (10 || 40) + 4

= 12 Ω

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