ELEC4614 Power Electronics School of Electrical Engineering & Telecommunications University of New South Wales ELEC4614 - Power Electronics Solution of Tutorial 1 - Basic Concepts in Power Electronics Question 1. (a) Vd VT 300 I T Rds 200 A This neglects the on-state voltage drop of the R 1.5 switch. This is only acceptable when the on-state voltage is small compared to the DC supply voltage Vd (= 300V in this case). t During turn-on time‚ vT (t ) Vd 1 ; again neglecting
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Electronic Mall By the increase in the internet usage in different aspects of today’s life‚ the amount of creative and innovative ways to utilize the electronic world have eventually increased. It is easy and popular among the users to use search engines as a method to gain access to a specific product or service. However‚ while using the internet for their shopping‚ they may face difficulties regarding to lack of enough information about the product or service they are looking for‚ such as
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True/False Indicate whether the statement is true or false. 1. The voltages in digital electronics are continuously variable. False 2. A digital system with 4 inputs can have any input combination represented by a hexadecimal numeral. True 3. Frequency is the number of times that a periodic waveform repeats per second. True 4. The period of a waveform can be found by 1/frequency. True 5. The falling edge of a signal is the transition from a HIGH to a LOW. True 6. The
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Power electronics Mid-1 Objective exam 2011 1.When UJT is used for triggering an SCR‚ the wave shape of the voltage obtained from UJT firing circuit is a a) Sine wave (b) saw tooth wave (c)trapezoidal wave (d) Square wave 2. In a thyristor circuit‚ the angle of conduction can be changed by changing (a) anode Voltage (b) Anode Current (c) Forward Current rating (d)gate Current 3. Freewheeling diodes are mainly used for (a) Better utilization factor (b) di/dt protection
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focuses on the problems encountered by stakeholders who interface with the deeds office using the paper-based system of conveyancing. The author shall further advocate for the abandonment of the current paper based system to adopt and establish electronic-conveyancing‚ the endeavour being to ensure speedy registration to maintain security of title and making sure that transfer of immovable property is not hampered by operational inefficiencies. Against that background‚ this chapter is going to discuss
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Xerox‚ during this time‚ was a power house of innovation‚ many aspects of the modern computer; the mouse‚ laser printers‚ Ethernet‚ and color graphics were all founded. In 1974 an employee of Xerox‚ Nicholas K. Sheridon invented the basis for modern electronic paper technology‚ the Gyricon. The Gyricon has many of the same properties as paper; it is flexible‚ contains an image‚ but it can also by erased and rewritten thousands of times. In the nineties‚ as the personal computer became more popular more
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Electronic cigarettes‚ or e-cigarettes‚ have become increasingly popular in recent years. Regular cigarette smoking has been on the decline due to many factors including price‚ health risks‚ and the fact that most public places no longer allow indoor smoking; making it an inconvenience to step outside and light one up. The convenience‚ affordability‚ and health benefits are just a number of reasons the electronic cigarette is rising in popularity. A comparison between e-cigarettes and regular
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Samsung Electronics case study The Samsung Electronics Company was the largest conglomerate in South Korea. The total net sales of the Samsung Group were $135 billion in 2004. It has 337 overseas operations in 58 countries. Electronic‚ finance‚ and trade and services were the three core sectors within the Samsung Group. Semiconductor products were classified into two different categories of chips‚ which are memory and logic. To focus on the global memory chip industry
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BASIC DIODE ELECTRONICS INTRODUCTION TO DIODES The p-n Junction The p-n junction is a homojunction between a p-type and an n-type semiconductor. It acts as a diode‚ which can serve in electronics as a rectifier‚ logic gate‚ voltage regulator (Zener diode)‚ switching or tuner (varactor diode); and in optoelectronics as a light-emitting diode (LED)‚ laser diode‚ photodetector‚ or solar cell. In a relatively simplified view of semiconductor materials‚ we can envision a semiconductor as having two
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Chapter 15 E-Commerce Strategy and Global EC Learning Objectives Upon completion of this chapter‚ you will be able to: 1. Describe the strategic planning process. 2. Understand how e-commerce impacts the strategic planning process. 3. Understand how EC applications are formulated‚ justified‚ and prioritized. 4. Describe strategy implementation and assessment‚ including the use of metrics. 5. Understand the causes of EC failures and lessons for success. 6. Evaluate the issues
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