U=8 B I=4 A E=12 B r=?
I=E/(R+r) U=I*R E=U+I*r I*r=E-U
r=(E-U)/I=(12-8)/4=1 Ом
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Verified answer
U=8 B I=4 A E=12 B r=?
I=E/(R+r) U=I*R E=U+I*r I*r=E-U
r=(E-U)/I=(12-8)/4=1 Ом
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Verified answer
По закону Ома для полной цепи: I = e / (R + r) <=> e = IR + Ir = U + Irследовательно, r = (e - U) / I = (12 - 8) / 4 = 1 Ом