What are the source voltage and source resistance, respectively

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What are the source voltage and source resistance, respectively for the Thevenin’s equivalent circuit as seen from the terminals indicated in the circuit given above?

1. 2·0 V, 24Ω
2. 20V, 48Ω
3. 20V, 4·8Ω
4. 20V, 12Ω

Correct Option: B

The given circuit:

Voltage at point A, V_A =	40 × 100	= 40V
	40 + 60

Voltage at point B, V_B =	60 × 100	= 60V
	40 + 60

V_{th>/sub> = V_BA = 60 – 40 = 20V
Equivalent circuit for calculating R_th is shown below:

From figue, R_th = R_AB = (60||40) + (40 ||60)
= 24 + 24 = 48Ω.}