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The Thevenin equivalent of the following network between A and B is—
Correct Option: A
Calculation for Rth to calculate the Rth. Let us assume an imaginary source say 10 V is connected across the open terminal and current I is flowing due to this imaginary source than
Rth = | I |
applying KVL, we get 10 – 6I – 10 (I – 0.8I1) = 0 .....(i)
KlL at node A, gives I = – I1 ....(ii)
from (i) and (ii)
10 = 6 I + 10 (I + 0.8 I) (I – 0.8 I1) 6Ω
10 = 6 I + 18 I
10 = 24 I
I = | 24 |

Rth = | = | = 24 | I | 10/24 |
Calculation for Vth: As, I1 = 0 dependant source will be acts as open circuit and the circuit becomes as shown.

So, the Thevenin's equivalent circuit between terminal A and B is shown below.
