[填空题]
An ammeter whose intern m*1lbc 2l *60xy ua8r.pa0ueisub4ju al resistas2j-z 65 w seltuuk5v8nce is $63\Omega$ reads 5.25 mA when connected in a circuit containing a battery and two resistors in series whose values are $750\Omega$ and $480\Omega$. What is the actual current when the ammeter is absent? $ \times10^{ -3}\;A$
