A.10Ω B.100Ω C.1KΩ D.10KΩ
A.R=R1+R2 B.R=R1×R2 C.1/R=1/R1+1/R2 D.1/R=1/(R1+R2)
A.C=C1+C2 B.C=C1×C2 C.1/C=1/C1+1/C2 D.1/C=1/(C1+C2)