Question

  R1= 25 Ом

  R2= 20 Ом

     U= 100 B

     t= 3 мин

     Q - ?

Answer 1

I1=U/R1= 100/ 25=4A
I2=U/R2=100/20=5A
Iобщ=I1+I2= 5+4= 9A
Q=I^2Rt
Q=81А*45Ом*180с= 656,1кДж