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Q=dW
W=UIt
R=U/I
U=I*R
W=I*R*I*t
W=I^2*R*t
W= 2,5^2 * 0,4 * 12
W= 30 J
W=U*I*t
prawo Ohma I=U/R stąd U=I*R
podstawiam do wzoru na pracę
W=I²*R*t=2,5²*0,4Ω*12s=30Ws