[填空题]
(a) What is the equivalent resisiwq3m6hk q.q4 :rd s/ktance of the circ4vvpe--g/sb,u1u pc zka;0 iv uit shown in (Fig. Below)? $R_{eq}$ $\approx$ $\Omega$(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