In the figure below, the current of 1 ampere flows through

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In the figure below, the current of 1 ampere flows through the resistance of—

1. 4 Ω
2. 20 Ω
3. 30 Ω
4. 12 Ω

Correct Option: D

In order to know the branch element in which current as flowing 1 amp. first of all we will calculate the voltage drop across the each subgroup. The given circuit is.

V_AB = 120 ×	12	= 72 V
	20

V_BC =	120 × 2	= 12 V
	20

V_CD =	120 × 6	= 36 V
	20

I =	120	= 6 amp
	20

since voltage drop across BC is 12V.

so current flowing in 12 Ω resistor is =	12	= 1 amp
	12

Thus, we can say 1 amp current flows through the 12 Ω resistance.