[填空题]
(a) What is the equivalent resistance o+s7y/t9 u kcgrf the circuit shown in (Fig. Below)?7v41 9x p)fb.ylbx;uz )hwfvp $R_{eq}$ $\approx$ $\Omega$(retain one decimal places)
(b) What is the current in the $18-\Omega$ resistor? A
(c) What is the current in the $12-\Omega$ resistor? A
(d) What is the power dissipation in the $4.5-\Omega$ resistor? W