  Electric circuits are known to realize topological quadrupole insulators. We
explore electric circuits made of capacitors and inductors forming the
breathing Kagome and pyrochlore lattices. They are known to possess three
phases (trivial insulator, higher-order topological insulator and metallic
phases) in the tight-binding model. The topological phase is characterized by
the emergence of zero-energy corner states. A topological phase transition is
induced by tuning continuously the capacitance, which is possible by using
variable capacitors. It is found that the two-point impedance yields huge
resonance peaks when one node is taken at a corner in the topological phase. It
is a good signal to detect a topological phase transition. We also show that
the topological corner resonance is robust against randomness of capacitance
and inductance. Furthermore, the size of electric circuits can be quite small
to realize the topological phase together with topological phase transitions.
