[填空题]
A flash lightbulb rated at 2.5 W and 3.0 V is operated by aqpz4ktx s: 8ku-z vq;: 9.0-V battery. To vpi7 6qmh37;tetgx- c;co v:ulight the bulb at its rated voltage and power, a resistor R is connected in series as shown in (Fig. Below). What value should the resi tgm;pti;hv e 7cu3ov:q6c-7x stor have? $\Omega$
