For the a.c. circuit given below, what is the value of I?

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For the a.c. circuit given below, what is the value of I?

1. 1 + j 1
2. 1 + j 0
3. 0 – j 1
4. 0 – j 0

Correct Option: D

The given circuit:

I =	V	=	120
	Z_eq		(60 + j 60) \|\| – 120j

or

I =	120

	60 (1 + j) × (– 120j)
	60 (1 + j) – 120j

or

I =	120

	60 (1 + j) (– 120j)
	60 (1 – j)

or

I =	(1 – j) j	=	j + 1	= 0
	(1 + j)		1 + j

or
I = 0 + j 0
Hence alternative (D) is the correct choice.