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$$
\begin{array}{l}{\text { In each circuit following Figures, either the value of } v \text { or } i \text { is not known. }} \\ {\text { a) Calculate the values of } v \text { and } i .} \\ {\text { b) Determine the power dissipated in each resistor. }}\end{array}
$$

$$
V=I R=1 * 8=8 V
$$

$$
P=I^{2} R=(1)^{2} * 8=8 w
$$

$$
P=\frac{U^{2}}{R}=\frac{(8)^2}{8}=8 w
$$

$$
P=VI=8 * 1=8 w
$$

$$
R=\frac{1}{G}=\frac{1}{0.2}=5 \Omega
$$

$$
V=I R=I * 5
$$

$$
50=5 I
$$

$$
I=\frac{50}{5}=10 A
$$

$$
P=V I=50 * 10=500 \mathrm{W}
$$

$$
P=I^{2} R=(10)^{2} * 5=500 l
$$

$$
V=-I R
$$

$$
V=-1 * 20=-20 v
$$

$$
P=I^{2} R=(1)^{2}*20=20 \mathrm{w}
$$

$$
V=-I R=-I*25
$$

$$
50=-I * 25
$$

$$
I=\frac{-50}{25}=- 2 A
$$

$$
P=I^2 R=(2)^{2}*25=100 \mathrm{w}
$$

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