If a resistance R of 1 Ω is connected across the terminals

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If a resistance R of 1 Ω is connected across the terminals AB as shown in the given figure, then the current flowing through R will be

1. 1 A
2. 0.5 A
3. 0.25 A
4. 0.125 A

Correct Option: B

Shorting the voltage source and opening current source, we have Z_TH = 1 Ω looking left into terminal AB.

Now, for V_TH, from the circuit, we have
V_AB = V_TH = 1 volt
Then, current through R

=	V_AB	=	1	= 0.54
	R + Z_TH		2