[填空题]
A battery with an emf of)crl1zki. s7l h / twv-)sqy-ucha-5)/m-(p -u:atu6my. n hoyrp lsi$12.0\,V$ shows a terminal voltage of $11.8\,V$ when operating in a circuit with two lightbulbs rated at $3.0\,W$ (at $12.0\,V$) which are connected in parallel. What is the battery’s internal resistance? $\Omega$