Examples: Find the Thevenin and Norton equivalent circuits for everything between points A and B for each of the four circuits in Fig.

Answer

a$.$Vthev $=2$V$,$Rthev $=100$ohm$,$ Inort $=0\mathrm{.}02$A

b$.$Vthev $=6$V$,$Rthev $=300$ohm$,$ Inort $=0\mathrm{.}02$A

c$.$Vthev $=3$V$,$Rthev $=60$ohm$,$ Inort $=0\mathrm{.}05$A

d$.$Vthev $=0\mathrm{.}5$V$,$Rthev $=67$ohm$,$Inort $=0\mathrm{.}007$A

I have the answer but some part I don't know how