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12v=4x /÷4
3v=x
3v×3=9v
3v×1=3v
Na jednym oporniku jest 9v a na drugim 3v.
P2=3*P1=3*U1*J
P=P1+P2
U*J=U1*J+3*U1*J
U1=U/4
U2=U-U1