After finishing his studies in Austria, Kapp moved to England where he was naturalized in 1881. He was awarded a Telford Medal in 1885/6. In 1904 he was offered the position as the first Chair of Electrical Engineering at the University of Birmingham, a post he held until 1919.
Kapp developed the basis for the calculation and construction of alternating current, dynamos and the transformer. The Electronic, Electrical & Systems Engineering Department at the University of Birmingham is situated in a building named after him.