[填空题]
A flash lightbulb rat)vvn1i agc, o1ed at 73 qegpjm:a.c2.5 W and 3.0 V is operated by a 9.0-V battery. To light the bulb at its rated voltage aj7c:e.q3 ga mpnd power, a resistor R is connected in series as shown in (Fig. Below). What value should the resistor have? $\Omega$
