Answer :

(a) Let I_{1}, I_{2} and I_{3} be the current flowing through the resistors of 5 ohm, 100 ohm and 30 ohm, respectively.

According to ohm's law V=IR

Here V= 12 V and R = 5 ohm

I = V/R

Current through R_{1} = V/R_{1} = 12/5 = 2.4 A

Current through R_{2} = V/R_{2} = 12/10 = 1.2 A

Current through R_{3} = V/R_{2} = 12/30 = 0.4 A

(b) Total current in the circuit =Current through R_{1} +Current through R_{2} +Current through R_{3}

= 2.4 + 1.2 + 0.4 = 4 A

(c) Total resistance in the circuit = R

R= 3 ohm

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