Direct Current In The Electromagnetic Field
Electromagnetism, other than its visible portion can be counterintuitive and hard to grasp because it is beyond the scope of our senses. It is noiseless, invisible and doesn’t smell. It is like a wave of energy surrounding any electrical device. Higher the frequency higher the energy it carries. It is probably easier to conceptualize sound waves because they are mechanical waves that are audible to us. Mechanical waves travel through a medium such as air, water and even solid walls. Electromagnetic waves can travel through vacuum and any medium at speed of light with few exceptions such as Faraday cage. Predicting field strength at a given location with respect to a transmitting device or base station is a very complex issue. It depends on …show more content…
As current begins to flow, a magnetic field begins to be set up instantaneously at right angles to the electric current. The two move together perpendicular to each other as well as to direction of flow of current. When appliances are turned on simultaneously in our kitchens, a significant magnetic field may build up. Electromagnetic field around a direct current is stable and uniform whereas in case of alternating current it disappears and reappears with its poles reversed every time current changes its direction. Electric field and magnetic field are essentially two properties of the same energy. Magnetic field moves around electric circuit when current flows. Depending on its strength at the source, magnetic field from the source diminishes as it moves outwards. For instance in case of residential wiring, it is about ¼ at 1 foot and at 4 feet it is minimal. Electric field is measured as Volts/meter and Magnetic field as Gauss in North America or Tesla in …show more content…
Electromagnetic Field (EMF) is the field through which electromagnetic radiation (EMR) travels. As an electromagnetic wave propagates through space, energy is transferred at the receiving end. Electromagnetic energy, however, doesn’t always have to be guided by a conducting wire. Nature is the foremost example of wireless technology. For instance, lightning during a thunderstorm and arrival of sunlight at sunrise is an example of wireless flow of electromagnetic energy in nature. In 20th century, however, electromagnetic energy has been harnessed to a point that its flow across the space, unguided by any wire(s), has become subservient to
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