| Ohmic Heating |
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| CATEGORIES ABOUT JOULE HEATING | |
| physics | |
| thermodynamics | |
| electricity | |
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It is now known that Joule heating is caused by interactions between the moving Particles that form the current (usually, but not always, Electrons ) and the Atom ic Ions that make up the body of the conductor. Charge d particles in an Electric Circuit are Accelerated by an Electric Field but give up some of their Kinetic Energy each time they collide with an ion. The increase in the kinetic or Vibration al energy of the ions manifests itself as heat and a rise in the temperature of the conductor. Hence energy is transferred from the electrical Power Supply to the conductor and any materials with which it is in Thermal Contact . Joule heating is also referred to as ohmic heating or '''resistive heating''' because of its relationship to Ohm's Law . It forms the basis for the myriad of practical applications involving Electric Heating . However, in applications where heating is an unwanted By-product of current use (eg. Load Loss es in Electrical Transformer s) the diversion of energy is often referred to as '''resistive losses'''. The use of High Voltage s in Electric Power Transmission systems is specifically designed to reduce such losses in cabling by operating with commensurately lower currents. The Ring Circuit s, or ring mains, used in UK houses are another example, where power is delivered to outlets at lower currents, thus reducing Joule heating in the wires. |
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