De or het wisselstroomtheorie?

The correct Dutch article is:

de wisselstroomtheorie

How to use wisselstroomtheorie

the wisselstroomtheoriede wisselstroomtheorie
this wisselstroomtheoriedeze wisselstroomtheorie
that wisselstroomtheoriedie wisselstroomtheorie
our wisselstroomtheorieonze wisselstroomtheorie
your wisselstroomtheoriejouw wisselstroomtheorie
every wisselstroomtheorieelke wisselstroomtheorie
which wisselstroomtheorie?welke wisselstroomtheorie?
a big wisselstroomtheorie / the big wisselstroomtheorieeen grote wisselstroomtheorie, de grote wisselstroomtheorie