1) б

2) I = q/t

0.6 = q/4*60

q = 144

3)R = U1/I1 = 8/4 = 2 Om

I2 = U2/R = 6/2 = 3A

4)I = U/R

R = p*l/S

I = U/((p*l)/S)

2.25 = 45/(0.4*l / 1)

L = 0.5 м

5 хз