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czyli q=J*t
q=10 A* 2 s= 20 (A*s=C)
U=W/q
W= U*q
W= 220 V * 20 C= 4400 (V* C= J/C *C=J)
W=4400 J
Moc:
P=W/t
P= 4400 J/2 s= 2200 (J/s= W)