Electrics Essay Example | Topics and Well Written Essays - 2250 words

Electrics - Essay Example one watt is equivalent to 1 joule of energy per second. It is basically a measure of the rate of energy consumption. All the electrical appliances like bulb, refrigerator, television sets, computer, printer, iron consume some amount of electricity which decides their wattage. As a thumb rule, more the wattage more will be electrical consumption by that product. v. Farad (F): It is the SI unit of capacitive charge. An electric capacitor is made up of two parallel plates. As a result of electrical current some charge is stored on the plates of the capacitor. This charge is measured in Farad. One Farad is the capacitance having an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 voltage between the plates. If the charge stored is less in quantity, it is measured in Micro-Farad (F) or Pico-Farad (pF). vi. Henry (H): It is the measure of inductive force produced in an inductor. Electromotive force is produced when we vary the current in an inductor. One volt of electromotive force (emf) is produced when the current is varied at the rate of one ampere per second. The unit is named after Joseph Henry, an American scientist of 18th century, who discovered electromagnetic induction. a. Temperature Coefficient of Resistance: This coefficient depicts the effect of temperature on the resistance of an electrical conductor. Increase or decrease of temperature affects the movement of the molecules within an atom. As temperature rises the movement increases, which in turn results in more collision amongst the molecules, thus impacting the specific resistance of the material. Therefore, in general the value of resistance (measured in ohms) of a material will depend upon the temperature coefficient of the resistance for the conductor. The total resistance for a material can be defined as; R = Rref [1 + (T-Tref)] Ohms or Where, R = Resistance of the conductor at a temperature, 'T' Rref = Resistance of conductor at a reference temperature of Tref. The Tref is usually 200C and sometimes for experimental purposes it is 00C. = Temperature coefficient of resistance for conductor material. T = Conductor temperature in degrees Celsius T = Reference temperature at which the Temp. Coefficient for the material is defined b. Relative Permittivity of Substance (r): It is the Ratio of the electric field strength in vacuum to that in a given medium. i.e. r = / o Where is the permittivity of the substance and o is the permittivity of the free space. The relative permittivity is also known as the dielectric strength of the substance. The dielectric constant is a complex constant with the real part giving reflective surface properties. The relative permittivity values affect the magnetic and electric behaviour of a conductor. The value of relative permittivity of a given substance keeps varying depending upon the electrical frequency, temperature etc. c. Magnetic Hysteresis: The Hysteresis is a magnetic property of a substance. This phenomenon is generally observed in ferromagnetic substances like Iron, nickel, cobalt etc. This group is called ferromagnetic as iron or 'ferric' is an

Budgets Assignment Example | Topics and Well Written Essays - 750 words

Budgets - Assignment Example Operational review enables the company to compare its current data with the past. By looking at the past trend and history of the company the company will establish its position in comparison with the past. Financial ratio technique enable the company to take current financial statement apply mathematical formulas to it and then coming up with a metric. Once financial ratios are applied in other companies then it becomes possible to compare one company to another. Financial ratio technique is the best because it enables a small company to compare itself with a bigger company (Platen & Heath, 2009). Financial ratio also makes it possible for companies that are equal in both size and capacity to compare their performance. Operational review will not be giving a company its true positions in the market because the company will not compare itself with others. 2 If the workload required to keep business fully in operation is not estimated correctly, this will drastically reduce the value of operating budget because before making any budget proposal one is first required to estimating the workload required to accomplish its activities so as to determine the budget allocation (Platen & Heath, 2009). ... the task of allocating funds to the operation of various departments or sections within the company organization, and thus making sure each area has what it needs to manage its assigned tasks efficiently Rigidity reduce the value of operating budget, operating budget ought to be adjusted from time to time because more often there are surprises within organizations. Changes should be allowed to be made to the budget because frequently there are shifts in the amount of revenues generated. At some point in the middle of the business there could be adjustments in regard to projected changes in consumer demand. 3 Time: How long will it take to implement a project right from its initial stage until its completion? This includes the time taken by staffs. It is the number of hours and days that a project or program take before its impact is recognized. A project that takes the shortest time to be completed is given a score of 5. The faster the project is the lesser the resources that will be used (Hope & Fraser, 2003). Every initiator or overseer of a project should ensure that he takes time seriously because time is of essence. If the project was intended for specific population within a specific time delay will render that project useless because it will no longer serve its intended purpose. Impact: The changes in a situation that results from the combined effects of project activities, or the extent to which the goal are achieved. Impact also refers to any unintended positive or negative changes that arise from a project completion. If project have a great impact it means that it is successful. A project with greatest impact is given a score of 5. For a project to be rated successful its impact must be felt across the board (Hope & Fraser, 2003). In the course of executing