There are information files on Learned that you may wish to use to get you started. ) a. ) Iron and stainless steel b. ) Iron is used in power transformers as a core. Stainless Steel AC motors c. ) retentively – the ability of a substance to retain or resist magnetic z action, frequently measured as the strength of the magnetic field that remains in a sample after removal of an inducing field. Coercively – The magnetic intensity needed to reduce to zero the magnetic flux density of a fully magnetized magnetic specimen or to diamagnetic a magnet. D. )Retentively ; Magnetism that is introduced to iron is only temporary.
Once the magnetism is removed then the iron will lose its magnetic strength over a set period of time. Were as magnetism induced in steel is permanent. Coercively -? Iron become denaturized at 2 rested denaturized at 10,000 H (owe) http://dictionary. Reference. Com/browse/retentively Steel become A. C. UP Describe the arrangements and features of an electrical supply system from generation through to transmission and distribution to end users Task 2 By research and investigation describe the arrangements and features of an electrical supply system from generation through transmission and distribution to end users.
You should have images and a description of each stage in the distribution network from the source of the electrical supply through to the customer. Include the typical voltage values that are used to distribute the electricity at each stage in the system. (There are a couple of information files on Learned that you may wish to use to get you started. ) First stage is generation of the power this can be done via various means as shown on the diagram on the right. Second Stage – The power that has been generated is carried into a transformer which increases or decreases the voltage to 400,000 volts.
Third stage – A step down transformer, lowers the voltage from 400,000 volts too 132,000 volts. Forth stage – This is variable depending on where the power is going next if the power is going to heave industry it is lowered to 33,000 volts using a step down transformer. If going to light industry then the power is dropped down to 1 1,000 volts. Then for household residences the voltage is transformed down to volts. A. C. UP Describe two different applications of electrical technology and, for each of them, describe how electrical energy is used to enable them to function.
Task 4 a. By research and investigation identify and then describe two different applications of electrical technology. B. For each of the two examples, describe how electrical energy is controlled and used to enable them to function. Examples could include: Manufacturing egg automated processes such as robotics and control systems. Healthcare egg ultrasound scanners or magnetic resonance imaging (MR.) scanners, operating theatre uninterruptible power supplies (UPS) etc. Entertainment egg sound and video systems, theme parks, music festivals etc.
Transport egg electric-trains, inner-city trams (The Docklands Light Railway and mom airport transport systems have no driver), electric cars, solar powered space travel etc. Computer us -a computer power supply has to covert AC current to provide an extremely steady DC current, as the components within a computer are sensitive to changes in voltage (such as CPU, gap etc. How does electrical energy used within a us? Firstly the electrical energy from the wall socket iv is inputted into a transformer this will lower it down to a specific value such as iv. A transformer is comprised of a soft iron core wound with two separate coils, one being large ( the one receiving the iv ) and one being smaller ( the one outputting the iv ) ). Once this stage has been complete the current will be rectified using diodes. This will convert the AC into pulsating dc current. Next the current is fed through a series of electrolytic capacitors this stored the positive waves and releases them at a discharge point, thus leveling out the pulsating level making a much steadier wave form.
Electric cars – are fully powered by electrical energy, they store this energy and battery’s which in turn power motors that are connected to a drive shaft to turn the cars wheels. How do electrical cars control the energy and use it? Firstly the power is stored in lithium-ion batteries the power is fed into these batteries from mains power iv were it is stored within the battery. This works because the electrons are drawn toward the negative and positive electrodes and separated by a separator. Once the batteries are charged and the car is ready to be moved the power stored inside the batteries travel to the motors.
First the power is transported through a rectifier (like the one mentioned is the us) to convert it to dc then the power is carried along wires that are wrapped along to sides of a magnet one being north one south. Between the two poles is a magnetic rotating rod. When the current flows over the magnets a magnetic field is induced which turns the rotating rod. The rod is then connected to a drive shaft. To increase the speed more current is added thus increasing the magnetic field size. A. C. MM. Explain the reasons for the use of a range of voltages in an electricity supply system.
Task 3 This is a continuation poof. Explain why a range of voltages is used such as; a. 15 to Kiev at the generators and b. Up to Kiev* for transmission c. And the reasons for other voltages (egg Kiev, 1 1 xv and 3. xv down to 400/230 volts) for industrial and domestic end users. *You should include and explain significance Of the following two formulae that support the use of high voltage for transmission. I. E. And A. )Generators use this range of voltages mainly because it would be unsafe to go above this level during the generation stage.
Most generators have specific rating that they can generate up to (Kiev). If generators produced more power it would lead to higher current levels meaning there would be heat losses etc. B. )Footages of up to Kiev are used for transmission as it reduces the power ass when transmitting over long distances because of the resistance cause by the wires. So when we look at we can take p as our power lost during transmission . So for us to have least power lost we need a small value of I (amps) so that when we times it by our r we get a small value for p.
So we look at the equation and from this we can identify that to get the same power being transmitted we just need to raise our voltage and low our current. Power loss – (p=Carr) & (p=FL) If we rearrange p=FL to make I=P/V and sub into P=Carr we get the equation c. ) 400/230 volts – This is the value used for household and domestic users. This voltage is chosen because anything over this value would be very deadly. The main reason these voltages are still in place is because it is a standard that cannot be changed as many household appliances work at within the 400/230 volts range. 3,000 volts – This level is used for heavy industry because the machinery and scale of the factories require this power to run. 1 1 xv -? light industry used this power levels as it is what the machines require to function, and because of the number off machines. A. C. DO Explain and justify how a practical application of electrical genealogy could be improved by making effective use Of available technologies. Task 5 This is a continuation poof. Explain and justify how one practical application of electrical technology could be improved by making effective use of available technologies that you may have mentioned in UP.