Respostas

2013-11-17T20:35:10-02:00
U= 220v
R= 11 ohms
delta t= 4hx 30 dias= 120h

U=RxI
I=U/R
I= 220/11
I= 20 A

a) E=Rx I^{2} xdelta t
E= 11x400x120
E= 528000wh→ 528kwh

b) 1kwh→0,65
528kwh→x
_____________________
x= R$ 343,20
1 5 1