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$$
\begin{array}{l}{\text { a) Use a series of source transformations to }} \\ {\text { find the voltage } v \text { in the circuit shown. }} \\ {\text { b) How much power does the } 120 \mathrm{V} \text { source }} \\ {\text { deliver to the circuit? }}\end{array}
$$

 

الخطوات

(1) تحويل مصادر الفولت إلى مصادر تيار

(2) تجميع مصادر التيار وتجميع المقاومات

 

$$
\frac{1}{R_q}=\frac{1}{R_{1}}+\frac{1}{R_{2}}+\frac{1}{R_{3}}=\frac{1}{20}+\frac{1}{5}+\frac{1}{6}
$$

$$
R_{eq}=2.4 \Omega
$$

$$
I=6+36-12=30 A
$$

$$
I_{1}=\frac{30*2.4}{1.4+1.6+8}
$$

$$
I_{1}=6A
$$                $$
V=8*6=48 V
$$

$$
P=-V_1
$$

$$
-120+20 I+6 * 1 \cdot 6+V=0
$$

$$
I=3-12 A
$$

$$
P=-V I=-120 * 3 .12
$$

$$
P=-374,4 w
$$

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