Hans Christian Oersted discovered that electric currents create magnetic fields, an important aspect of electromagnetism. He is still known today for Oersted's Law. He shaped post-Kantian philosophy and advances in science throughout the late 19th century. Oersted experiment was conducted on the phenomenon that compass will turn when heavy rain and lightning to try to see what will happen with the compass. If the power supply to the wire. He led wire perpendicular to the compass and found that nothing had happened. But after the lecture ended Oersted try to put the wire conductor parallel compass. And passing an electric current to the wire. Ben compass to find that wiggle and this discovery Oersted makes the first person to discover the relationship between electricity and magnetism or lead to theoretical relationship between magnetism and electricity (Electro Magnetism Theory)