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Posted on March 26th, 2012, by

Effects of Disk’s Properties on EMF and Induced Current in a Homopolar Generator.

The write up will be centered more on the aspect of physics as a discipline of study. In the world of physics as a conceptual science, noteworthy is the fact that important principles are always in application and in use for its studies. In the process of our work on the explicit explanation of the happenings in this concept, it is our obligation to encounter the need of laying more emphasis on the works, principles and proposals by great lived physicists and scientists. What is EMF? EMF means in full electromotive force and is the rate at which energy is drawn from an electric current providing source in a particular circuit. The electromagnetic activity is the basic area of our discussion.

The British scientist Michael Faraday in 1821 described electrical energy conversion into the mechanical form and this was achieved through dipping a free hanging wire into a pool of mercury on which had a permanent magnet.

This wire was seen to rotate around the magnet when a current was passed through it. This expressed the fact that a circular magnetic field developed around the wire due to the presence of the current that was passed through the wire. This is the concept of the simple form of devices called homopolar motors.

The description of the phenomenon of our practical setup will now be emphasized. There is the so called flux’ rule.

The flux rule explains that there is equality between electromotive force in a circuit and the rate of the change of the magnetic flux irrespective of the fact that the flux change is as a result of field changes or due to the fact that the circuit moves or when the flux change is as a result of these two phenomenon. There also exists what is a known phenomenon in physics as reciprocating electromagnetic dynamic activities between the conductor and the magnet.

This is considered specifically as dependent on the relative motion between the magnet and the conductor with emphasis on differentiating at a particular point in time which one of them is in motion. In a situation when the magnet is at rest and the conductor is in motion we will discover that there will be no electric field around this magnets vicinity. On the other hand, when the conductor is at rest and the magnet is in motion, there will be risen in the vicinity of the magnet a definitively energetic electric field which especially produces a current in the vicinity of situation of parts of the conductor. There is an electromotive force found in the conductor that gives rise to same intensity and same path electric current as that of the electric forces found in the previous case, during the moving period of the magnet. The electromotive force is in itself with no corresponding energy but exists as a result of equality in the relative motion.

The application of this Faraday’s law and principle of induction is seen in electric generator and is worthy of note.

The changing magnet field force that occurs when a magnet is rotated around a field conductor is the producer of this electric field which then pushes the charges along and through the cable wires.

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