串联：
I=Ia=Ib
U=Ua+Ub
R=Ra+Rb
P=Pa+Pb
W=Wa+Wb
Ua\Ub=Ra\Rb=Pa\Pb=Wa\Wb
并联：
U=Ua=Ub
I=Ia+Ib
1\R=1\Ra+1\Rb
或R=(Ra×Rb)\(Ra+Rb)
P=Pa+Pb
W=Wa+Wb
P=W\t
P=UI=I^2R=U^\R
W=UIt=I^2Rt=U^\Rt