If you are planning to visit electronica this year then try to make time to visit the statue that commemorates Georg Simon Ohm, the inventor of electrical resistance. The statue can be found in the grounds of The Technical University, a short distance from the central Karlsplatz area of Munich city centre.
Statue in commemoration of Georg Simon Ohm in the grounds of The Technical University Munich
Georg Simon Ohm was born in Bavaria in March 1789. As a mathematician and physicist he studied many aspects of electricity and electromagnetism. At the time that electromagnetism was discovered in 1820, the current flow was determined by measuring the magnetic flux surrounding a wire conductor. Ohm observed that the nature of the flux levels were dependent on the type of wire used. This captured his interest and marked the beginnings of his research to investigate if there was a relationship between voltage, current and the material used to create the wire.
Initially published as a paper in 1825, Ohm published a book in 1827 titled,
‘Die galvanishce Kette, mathematisch bearbeirtet’ in which he describes Ohm’s Law. His peers were rather sceptical at first about his theory but he finally received acceptance fourteen years later in 1841 when he was awarded with the Copley Medal from the Royal Society. Ohm died in July 1854, and the SI unit of electrical resistivity ‘the Ohm’ is named after him.
Ohm’s Law states that ‘the current flowing through a resistor is directly proportional to the applied voltage’, written as R =V / I, where R is the electrical resistance, V is the voltage and I is the current. Ohm's law is an empirical law, a hypothesis that is derived from a vast number of experiments that have followed the outlined principle. Although the law holds at a given temperature, it is possible for some materials to be "non-ohmic".
You can find an excellent summary of different kinds of resistors and how they function within Wikipedia. A more detailed guide to modern resistor technology along with specialist applications can be found in the Ultimate Guide to Resistors.
Vice president of engineering
Phil Ebbert, vice president of engineering, is in charge of resistor development at Riedon Inc. He is also responsible for its technology projects, including equipment, testing, and process design. He has 15 years resistor engineering experience and led Riedon’s expansion from wirewound resistors into related film and foil technologies. He studied physics, optics, and computer science at Carnegie Mellon University.