Range of semiconductor devices and circuits Coursework

Range of semiconductor devices and circuits - Coursework Example A good diode should posses forward to reverse resistance ratio of 10:1 with others with the ratio up to 100:1. If a diode is open, it will show infinite resistance in both directions. On the other hand, a shorted resistance will show low resistance in both directions. The procedure for testing the diode using an ohmmeter only is as illustrated in the following steps. 1. The Ohmmeter is configured to measure on the lowest range. If it’s a digital ohmmeter, a 2-kohm range or the nearest equivalent is used. 2. The ohmmeter leads are connected across the diode with the positive red probe on the P-material and the negative black probe on the N- material as shown in the diagram below. 3. The measured resistance of the diode is measured; Rf is recorded after which the setup is disconnected. 4. After the disconnection, the leads of the ohmmeter are reversed and connected in the reverse direction i.e. the positive red probe is connected to the N – material on the diode and the n egative black probe is connected to the P – material on the diode as indicated in the figure below. 5. The measured reverse resistance RR (reverse resistance is recorded) 6. The forward and the reverse resistance ratio is calculated as RR/RF 7. If the reverse resistance ratio is equal to one or very close to one, then the diode is faulty. In the same way the polarity of the diode can be identified. When the diode shows infinite resistance the material connecting to the positive red probe of the ohmmeter is the P – material of the diode. On the contrary, the part connected to the Negative black probe of the ohmmeter is the N – material of the Diode. Question3 VRMS = Vm*0.7071 = 100*0.7071 =70.71 Question 4 a) Ripple factor = Vrms/Vdc Capacitance = 50micro Farad 50*80*10-6 =4000*10-6 4*10-3 (4*10-3)*2500 10 10*2 = 20 20* v3 = 34.64 34.64*4 = 138.56 1/138.56 = 0.0072 Ripple factor = 0.0072*100% = 0.72% b) 50*100*10-6 5*10-3 (5*10-3)*12000 60,000*10-3 =60 60*2 = 120 120* v3= 207.84 207.84*4 = 831.38 1/831.38 = 0.0012 Ripple factor = 0.0012*100% = 0.12% Question 5 Block diagram of a complete power supply Analyze the operation of different types of amplifier Summing up amplifier This type of amplifier is used to add two voltages. The output voltage is equivalent to the sum of the input voltages. With summing up amplifiers, the output voltage cannot be greater than the power supply in case of exceeding the power supply, the amplifier is damaged. Summing up amplifiers are of twp types, Non – inverting and inverting amplifiers. Non – inverting amplifiers does not have an effect on the polarity of t

Obamacare Essay Example | Topics and Well Written Essays - 750 words

Obamacare - Essay Example There are various advantages of the Obama health care plan. First, the act reduces the overall health care cost by making services available to the people who had no access to insurance (Chrumbelievable, 2012). Such people initially often used hospital emergency room as the primary care with increased medical cost. This will be a relief to such people. In addition, it is a relief to those who cannot afford health insurance. This is because the federal government will pay the state to incorporate them in the Medicaid (Chrumbelievable, 2012). Secondly, those who fail to qualify for expanded Medicaid due to low income the state will be compelled to set up insurance exchanges to alleviate the burden of getting private health insurance coverage (Chrumbelievable, 2012). Thirdly, those with preexisting conditions like children will not be denied insurance cover. Additionally, insurance company will not drop anyone from the cover once they become sick. Moreover, parents can now put their chi ldren on their health insurance cover up to 26 years old (Chrumbelievable, 2012). This will be advantageous to the insurance companies because they will get more premiums at a lower cost on covering healthier individuals. Equally, small business are spared by this care while large business are only required to offer health insurance, but receive tax credits to help employees pay premiums (Chrumbelievable, 2012). On the other hand, the Obamacare also has disadvantages. First, the increased coverage is likely to raise the health care costs. This is because a large group of people will receive preventive care and testing without establishing whether they had critical illness (ProQuest, n.d.). Secondly, the drug cost is likely to increase in the future as the pharmaceuticals companies are forced to pay over $80 billion in fee of closing the â€Å"donut hole† (Pipes, 2010). Some business may be discouraged to hire new employees. For example, the medical-device manufacturer and importers are required to pay a 2.35 excise tax (Pipes, 2010). There is also likelihood of tax being raised in the majority of the population. The Obamacare is in consistency with the constitutional framework of federalism. This is because the enactment of the Obamacare preserved state sovereignty (Democrat, 2012). Although it had numerous stringent federal mandates, the state had maintained substantial