I am a complete beginner in circuit analysis and while reading the book „Circuit analysis for dummies” I’ve come across the following circuit:
What I don't understand is the "Vx" labelling assigned to voltage across resistor R1 and not R1 + R2 as it would occur from the source transformation applied to the Is current source (later in the text it is explicitely pointed out that Va = Vx). Here is what happens after the source transformation:
Now, according to what wikipedia says (https://en.wikipedia.org/wiki/Dependent_source) the transformed circuit is a voltage controlled current source and the voltage across both the R1 and R2 resistors in series is a factor (Vx) to the current source (gVx), but the book says that only voltage across R1 should be the factor. Could someone tell me where I am wrong?
(Update) OK, all answers and comments so far tell me that I performed the source transformation too eagerly thus losing the original Vx. As far as I know, the first picture in my question shows the so called hybrid model of the circuit. How would the standard one (i.e. with a BJT transistor instead of the dependent source) look like? How would be the R2 resistor connected in such circuit?