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Circuit Theorems and Conversions - Engineering

Q1:

Referring to circuit given, if R1 is changed to a 68 resistor, what will be the current through it?

A 0.16 A

B 0.24 A

C 0.2 A

D 0.04 A

ANS:A - 0.16 A

Is1 & Is2 are independent time-invariant current sources. Is1 divides into two branches.
That's why the current through 120 ohms branch is different between Is1 & Is2. The current will not change either 120ohms is changed to 68ohms since it has an independent current source.