P 5.2-7 The equivalent circuit in Figure P5.2-7 is obtained from the original circuit using source transformations and equivalent resistances. (The lower case letters a and b identify the nodes of the capacitor in both the original and equivalent circuits.) Determine the values of R_a, V_a, R_b and I _b in the equivalent circuit.

Figure P 5.2-7

Let’s start on the left. The 2.2 A source and the 10 Ω resistor can be transformed into a 22 V source in series with the 10 Ω resistor and the left side of the circuit now looks like

This can be simplified to

Now go to the right side. The 36 V source and the 18 Ω resistor can be source transformed to

This can be simplified to

So the transformed circuit now looks like

So by comparison with the equivalent circuit we can identify

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This page last updated on February 17, 2019