Faradays Law vs Amperes Law - Essay Example

?Insert of Faraday’s law: Ampere’s law Several thoughts always cross our minds whenwe see a light bulb illuminate the house in a chilly evening. The streets appear brighter during the night despite the surrounding darkness in the place where we might happen to be in. More fascinating occurrences often hallucinate our understanding with regard to how certain things operate. Even the most common things such as cell phones which we use in our everyday lives sometimes pose a lot of questions in our minds concerning how they actually operate. We have to charge our cell phones whenever they are exhausted of energy/power. This we have to do by using electricity and we wonder how electricity and the cell phones are related such that we are able to communicate with people far away from us once the two have been fused together. Sometimes, we have magnets which attract certain things such s iron materials and other types of magnetic materials. We wonder where such force of attraction is originating from inside the magnet, just a piece of steel or iron. All these fascinations are the results of certain discoveries made some time back in the history of science and have been integrated over time to operate in some ways which actually make life easier and convenient. The relationship between electricity and magnetism can be traced back to the times of the greatest scientists who contributed so much to the development of electricity ad electric discoveries such as Michael Faraday and Ampere. This paper will look at the integration between the two laws developed by Michael Faraday and Ampere to explain the relationship between electricity and magnetism. Michael Faraday developed a law which tried to explain this relationship by drawing a connecting line between electric transfers and magnetism. The laws can be defined in terms of electromotive force (emf), the force believed to be the driving force of an electric current, as Faraday notes. The law states that: “A time- changing magnetic flux though a closed circuit induces an emf in the circuit.” (Sadiku) Faraday’s electromagnetic induction can be divided into two laws which are however related to each other and tries to explain the flow and the induction of magnetism in a substance. The first law states that: “whenever a conductor is placed in a varying magnetic field, an emf is induced which is called the induced emf, if the circuit is closed, current is also induced which is called the induced current.” (Sadiku) The second law states that “the induced emf is equal to the rate of change of flux linkages whereby the flux linkage is the product of the number of turns of the coils n and the flux associate with it.” (Sadiku). According to this law, the number of turns in the coil will then determine the amount of current flowing through the wire and vice versa as shown in the diagram. This emf only last as long as the magnetic current within the circuit continues to change. In this way Faraday developed a law which describes the electromagnetic induction whereby, an electric field is usually induced or created by a changing magnetic field. When current flows in a solenoid wounded around a magnetic material, the material becomes magnetized and this creates the potential difference. It is this difference which keeps the current flowing from one point to another. The emf developed is the force that works against the electric potential commonly referred to as the voltage. The common voltage in dry cells is 1.5 and has the electric potential moving from the positive electrode towards the negative electrode. This potential shows that the cell has the capacity to do work on the electric charges. When a load such as the electric bulb or a CD player is connected to the cell's terminals, there is the flow of electric fields forces though the load making it possible to transfer the energy (in the form of electrons) from the positive electrode to the negative electrode. Andre Marie Ampere also developed a law which is used to determine the relationship between the magnetic field around a closed loop and the current enclosed by the loop. The magnetic field produced by a solenoid, and the measured current enclosed by the loop is equal to the current through the ammeter multiplied by the number of turns of the wire in the solenoid. As the amount of turns increase in the loop, the amount of current flowing through the loop also increases. The two laws can be fused together to help explain the way certain machines which we use in our daily lives actually operate. We will use the operations of the cell phones and the telephones which we use in our daily lives. In the real sense, it can be argued that it is Faraday’s laws which formed the foundations that were used by engineers to develop the telephones since these operates entirely on the basis of this law. The telephone wire is always connected to an alternating current commonly known as AC current. The alternating current has a constantly changing direction of flow which changes the potential difference between the two points (the positive and the negative electrodes). The alternating current aiding the flow of electric currents in an electric field will as well alternate the changes in the voices of the speakers leading to the voice recognition. It is due to the potential difference existing between the two points that the waves are able to flow from one point to the other detecting and transmitting the sound produced at both ends. The mobile phones operate in a way which is more similar to the traditional telephone lines even though it uses radio waves to transmit the signals from the sender to the receiver. These radio waves are created in the same way described in Faraday’s laws. The electromagnetic waves are categorized into various classes depending on their wave lengths; radio waves are grouped under those that have very large wavelengths and therefore travel at very low speeds. For this reason, radio waves are in most cases interfered with by certain factors such as the electrostatic charges. When these waves come across the paths of such, the direction of their movement has interfered with and therefore these waves are diverted from their normal paths and hence the common aspect of network loss which is a common complaint among many mobile users. The network interference can be minimized by using the Faraday shielding whereby the device using the radio waves such as the phones. In conclusion, I would like to reiterate here that the fundamental backgrounds of the laws developed by Michael Faraday and Amperes have formed the basis used in the development of the current developments in technology that we use today. The combination of the two laws often leads to the unification of the whole idea concerning the transfer of electric charges from one point to another due to the creation of a potential difference between these. Mobile telephony for example utilizes the applications behind the electromagnetic induction and the current flux developed as a result of electric flow in a coil wounded round a magnetic material such as an iron rod Work Cited Sadiku, Matthew. Elements of Electromagnetics. 4th . New York: Oxford UP, 2007. Read More