HOW DID MICROWAVE OVENS COME ABOUT?
The phenomenon of frictional heat caused by microwaves was discovered accidentally in 1946 during an experiment with a magnetic field tube. One of the researchers, Percy Spencer, noticed that a piece of chocolate he had been carrying in his jacket pocket had melted; he had not been aware of any heat. The discovery triggered off the development of kitchen appliances in the U.S utilizing this heating effect. Around 1952 a microwave oven, was first placed on the U.S market under license to the Raytheon Company. Nowadays Microwaves are used to detect speeding cars (speed detectors), to detect flying aircraft (radars), and to send telephone and television communications over long distances (satellite transmissions). Just in case there is any confusion over microwaves from the sun and microwave ovens, microwaves from the sun are based on principles of pulsed direct current (DC) that don’t create frictional heat. Microwave ovens on the other hand use alternating current (AC) creating friction
