James Clerk Maxwell- I developed a scientific theory to explain electromagnetic waves and I noticed that electrical fields and magnetic fields can couple together to form electromagnetic waves.
Heinrich Hertz- I showed experimental evidence light and heat are electromagnetic radiations.
André-Marie Ampère- I founded and named the science of electrodynamic
Michael Faraday- I discovered electromagnetic induction and has contributions on electrical engineering and electrochemistry.
Hans Christian Øersted- I discovered that electric currents create magnetic fields.