[填空题]
A battery produces 40.8 V when 7.40 792 lwis mlu8 i;sq hsy)qm-*d.i)asfA is dhgpsf.vk:hyy :)t/f+n- *p pjrawn from it and 47.3 V when 2.20 A is drawn. What are the emf and ifv-y k p+*tj hy.)sph n:pfg:/nternal resistance of the battery?
r = $\Omega$
$\varepsilon$ = V
