Tolong dong lumayan tuh poinya,lengkap yaa caranya please

R(hambatan)
I(arus listrik)
V(tegangan listrik)

1) cari R total : (R nya rangkaian seri)
R = 1+2+3
= 6 ohm
cari I :
V = I × R
20 = I × 6
I = 20/6 ampere
2) cari r total ( R nya rangkaian paralel)
1/R = 1/2 +1/3
R = 6/5 ohm
atau bisa cara cepat kalo ada 2 hambatan (Rangkaian paralel)
R = (2×3) : (3+2)
R = 6/5 ohm (paralel)
R total = 6/5 + 1 = 11/5 ohm
cari I
V= I× R
20 = I × 11/5
I = 100/11 ampere
3) cari r total {paralel}
1/R = 1/2 + 1/3 + 1/1
R = 6/11 ohm
(gak bisa pake cara cepat karena ada 3 rangkaian paralel.)
cari I
V= I× R
20 = I × 6/11
I = 220/6 ampere
4) cari r total
(pake cara cepat aja)
R= (1×2) + (1+2)
R = 2/3 ohm ( paralel)
R total = 2/3 + 3
R total = 11/3 ohm
cari I
V= I× R
20 = I × 11/3
I = 60/11 ampere