кпд=R/(R+r) 0,25*R=R+r 0,25*r=0,75*R r=0,75*1/0,25=3 Ом
Ik=E/r=6/3=2 A
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кпд=R/(R+r) 0,25*R=R+r 0,25*r=0,75*R r=0,75*1/0,25=3 Ом
Ik=E/r=6/3=2 A