The Study of Resistance and Current - Essay Example

and number: The study of resistance and current Introduction Resistance is defined as the pressure of pushing charges along an electric conductor while current is defined as the rate of charges which flows past a certain point in a circuit. This research will focus on using experiments to describe and give various properties concerning resistance and current (Jeong).During the research, there will be some experiments to prove that the resistance and current are always common in all the electrical conductors. Various properties of conductors will be studied. Among the main properties, the conductivity and resistance of various electric cables are researched on whether they are poor or good conductor Another area of research will be determining the different between resistance and current. The distinct properties of resistance and current will be considered in order to identify various types of resistance in conductors of electricity. Resistivity and conductivity are also studied in this research; the factors which influence the conductivity for instances temperatures are also studied.in addition to exploring various types of applications which has high resistance and current consumption the knowledge of electric generation will be featured (S. Knight). Method For further understanding of resistance and current, an experiment is performed in the laboratory in order to analyze the effects of resistance and current in electricity transmission. The following apparatus and materials required while carrying out the experiment (S. Knight). Ammeter, 0 to 1 A, DC, Voltmeter, (0-15v), DC Power supply, low voltage, DC Lamp holder (12 v, 6W) Resistors Other various components. Procedure, the experiment, will be set up in the diagram below, and the power supply will be turned on until the potential difference is recorded. (S. Knight) Results In the above set up, while the electrons are passing through thin metal filament of the lamp, the electrons face more opposition because the filament is thinner when compared to the wire used in the experiment. The opposition to electric current depends on the type of material, cross-sectional area and its temperatures (Jeong). Basically it can be said the conductors have low resistance while insulators have low resistance. The resistance reduces amount of current through the circuit and the bulb will glow depending on the amount of electrons passing through the wire. When electrons are moving against the same direction it causes friction, this is manifested in form of heat.at the same time the readings of ammeter changes. The concentration of heat in filament will force the bulb to glow. In the cases of short circuit, the bulb will stop glowing because there is no complete flow of electrons. There will be any resistance because the circuit is incomplete. When we use batteries in the above set up, the battery will run short of the charge because the electrons faces a lot of resistance hence discharging of electrons will be faster.in such cases the resistance will be the key factor which it discharges the battery. When bulb is removed and replaced with a variable resistor, when using a series resistance in the experiment it will result in less current and when the resistance is increased the current will reduce drastically (Jeong). And when there is increase in the number of filament lamps in the circuit there will be less current, bulbs will always resist the current in regardless of their voltage. Changing of voltage in the circuit too have an effect on the bulbs and ammeter, when there is too much current and less resistance the bulbs will blow up because the filament will not be a position to resist the current.in the circuit, when the ammeter for instance reading 0.1A,the bulb will glow. When the current is increased to 0.2A the bulb will glow brighter, also if the current is further increased to 0.3A the bulb will blow up. Discussion We can assume the amount water flowing from the tank through a pipe as current. When the pressure is increased the higher the flow of water, the water flowing through the pipe over certain period can be measured by volume on a given time. With electricity, we measure amount of charges flowing through a conductor over a given period. Current is measured in amperes, and it’s denoted by letter ‘I’. When two tanks with the same volume of water is fitted with different pipes, one with narrow and the other with bigger. When water is released and the pressure is measured from two pipes, the flow rate of flowing water from the narrower pipe is less when compared with the flow of water from narrower pipe. If the uniform pressure is required, the water level in the tank with narrower pipe is increased.in electrical terms, the current flowing through the thinner wire is less when compared with thick wire. If the same flow of current is needed in both wires (thinner and thick) the voltage should be increased hence causes the increase in current. Consider again two water tanks, fitted with narrow pipe and one with a big pipe. The narrow pipe cannot be fixed with other extensions of pipes because it has low pressure. When wider pipe is fixed with several extensions, the pressure is still constant because the pipe is wider, and the pressure is constant. Also if the water is added to the tank with narrower pipe still there will be resistance of water while flowing.in electrical terms, this is represented by two circuits, one with different resistance and the other one with the equal voltage. The circuit with high resistance will always allow fewer charges to flow, this implies that the circuit with less current flows. When we look again the tank with narrower and long pipe, the flow of water is high because of its pressure. This implies that any tank with higher resistance will always have low flow of current. Various types of current for instances, Conventional current flow which is basically the flow of positive charges in the circuit, being both negative and positive this current will give the flow of electrical current from positive to negative direction of electrons (S. Knight). Conclusion From the discussion of results, it can be concluded that resistance and current relate. This exhibited when the temperature affects the resistance and current, when the temperatures are low some conductors known as superconductors tend to allow the flow of electrons in constant mode when compared with high temperatures. Also, the resistance of materials largely depends on its length, resistivity of the material and cross-sectional area. Resistivity and conductivity are inversely proportional (S. Knight), good conductors have low resistivity while the poor conductors have more resistivity when compared with good conductors. The resistance reduces amount of current through the circuit and the bulb will glow depending on the amount of electrons passing through the wire (Jeong). When electrons are moving against the same direction it causes friction, this is manifested in form of heat, at the same time the readings of ammeter changes. This resistance causes the concentration of heat which will make the bulb to glow brighter. It’s evident that, in electrical terms, the current flowing through the thinner wire is less when compared with thick wire. If the same flow of current is needed in both wires the voltage should be increased hence causes the increase in supply current. Also in electrical terms, the flow of less electrons can be concluded using examples, it includes, the use of two circuits, one with different resistance and the other one with the equal voltage. The circuit with high resistance will always allow less charges to flow, this implies that circuit with have less current to flow through it. Lastly current is something which you cannot change, but if want to change u must adjust the resistance or voltage. Bibliography Jeong, Se-Young. "current ." current and applied physics (2013). S. Knight, E Buehler & I. Camlibel. "current- control negative resistance in CdSnP2." journal of applied physics v43 (2003). Read More