So you can combine all of the resistors to find the current through the circuit, but you have to leave them separated if you want to find v0. That makes sense; thanks to the both of you.
Hello, everybody.
I'm reading through my EE textbook and I'm having some confusion about when to combine resistors in series. The following figure is in my book:
I see that they combine the parallel resistors of 6Ω and 3Ω to make the equivalent circuit shown in 2.42b. What I'm confused...