Car ignition system Assignment Example | Topics and Well Written Essays - 1000 words

Car ignition system - Assignment Example The coil consists of an iron core that is laminated, surrounded by two copper coils. The iron core does not create a closed loop on the windings, forming a magnetic circuit that is open, unlike in the case of transformers. The energy stored in the core magnetic field is then transferred to the spark plug. The primary core winding turns are of heavy wire and are relatively few. The secondary core winding are of smaller wire and consists of several thousands of turns. The wires are insulated by enamel and oiled paper since they carry very high voltages. The coil is normally inserted in a plastic case or a metal can with insulated terminals. Two types of coils are used in Volkswagens; the Black coil and the blue coil (Vidler & Knowles, 2003). The table below shows the comparison of the two types of coils. High tension lead wires are used to connect an ignition coil, a distributor and magneto to the spark plugs. Each of the leads contain a single wire since the current does not come back through the same path, but through the grounded engine connected to the negative terminal of the battery. A spark plug lead should have a resistance range of between 14 to 16Kohm/meter (Bolton, 2005). When the ignition switch is closed, current from the battery builds up inside the primary winding of the coil. However, the inductance of the coil prevents instant flow of current. The flow of current inside the coil produces a magnetic field around the core. Current must be allowed to flow long enough in order to store sufficient energy for the spark. Once sufficient energy is built, the contact breaker is opened, and since it is connected to a capacitor, the capacitor and the primary winding form a tuned circuit. The oscillation of the stored energy between the capacitor and the inductor of the coil initiates changing of magnetic field in the core of the coiling

In Alice Walkers Everyday Use,----------The Seagull Reader Essay

In Alice Walkers Everyday Use,----------The Seagull Reader - Essay Example This story demonstrates that traditional people have the right to preserve their beliefs and practices without interference from modern-thinking individuals, because modernity and traditions are both valuable and no one is superior to another. Traditional people deserve the same respect and tolerance as modern-thinking individuals. Mama decides that the quilt belongs to Maggie, because they represent the African tradition of using quilts for their functional purposes. The quilt represents rural tradition that only Maggie understands and supports. The quilt has never fundamentally changed and has only expanded, as generations passed it from one family to another. Since Mama knows that Maggie will proudly continue this tradition, she asserts to Dee that Maggie deserves these quilts more than her. Dee reasons with her mother that: â€Å"[Maggie is] probably be backward enough to put them to everyday use† (Walker). She looks down on Maggie for being a rural woman with no education and â€Å"breeding.† She believes that by treating this quilt as an artifact, she provides a better use for her heritage. Mama, however, is tired of people belittling rural folk. She knows that the quilt belongs to Maggie, because unli ke Dee, Maggie will use it for everyday use. And that is what their tradition is for- to be lived each day of their lives. Modernity and traditions are both valuable to human identity. Mama and Maggie have not changed their traditional attitudes and lifestyles, while Dee completely chooses to change her identity, because she is ashamed of her rural background. Mama and Maggie live simple, rural lives. Mama milks cows, kills boars, and wears flannel nightgowns to bed and overalls throughout the day. Maggie helps her mother in their everyday farm and house chores. By describing how Mama and Maggie love their work, Walker argues that rural people are also happy and content with their lives. Dee is also pleased as a liberal woman. She is the kind of person, who: