tolong kerjakan y.....

1/R1 + 1/R2 = 1/Rt
1/10 + 1/40 = 1/Rt
4/40 + 1/40 = 1/Rt
5/40 = 1/Rt
40/5 = Rt
8 ohm = Rt

Rt + R3 = R
8 + 5 = R
13 ohm = R

V = i x R
6 x 13
78