Direct current Essays

  • Induction Motors Research

    2261 Words  | 5 Pages

    Chapter 1: Introduction 1.1 Background of study Induction Motors are widely used in industrial applications. It has been reported that they have a motor market share of approximately 80 percent. Their popularity stems from robust construction, low cost and ease of maintenance. As induction motors operate at a constant speed, they provide efficient operation in industrial applications if the loads that they drive remain fairly constant. However, the loads vary when the process conditions change during

  • EM Methods Advantages And Disadvantages

    773 Words  | 2 Pages

    electromagnetic geophysical methods have been used extensively and with great success to delineate conductive zones at depths. The aim of EM method responds to high conductivities rather than to contrasts in conductivity as is the case with the classical direct current (DC) method. This means that EM methods can detect small changes in conductivity in a conductive terrain by the correct selection of technique and array and secondly that resistive layers became transparent in contrast to the DC resistivity method

  • Supercapacitors Essay

    2290 Words  | 5 Pages

    energy, providing good power output as well as being able to be charged and discharged rapidly without deterioration of any type. A typical power storage device can be characterized by its power density and its energy density, noting that with our current technology, none which can achieve the best of both. A relatively new technology, electrochemical double-layer capacitors or also known as supercapacitors, ultracapacitors

  • I've Always Wanted to Be an Electrical Engineering

    553 Words  | 2 Pages

    Ever since my days in middle school in China, I have dreamed of being an electrical engineer. My father nurtured my copious ideas such as transformer and inductor. Even though I didn’t have too much idea about electrical engineering, I found abundant happiness though work activities that included practical and hand-on problems. During the past three years, I learned a lot concept including semiconductor, electromagnetic and signal at University of Illinois. I have explored ECE widely and eventually

  • Obtaining a PhD in power systems engineering

    1545 Words  | 4 Pages

    My life has been heavily freckled with a sense of adventure and research; a life that seeks to find the meaning of anything and will not stop till it gets to the depth of everything. This, perhaps, was responsible for damaging several electrical appliances when, as a boy, I was trying to discover what made everything that was not made in Nigeria work. It was this desire to discover things and break new grounds that spurred me into pursuing a career in the field I knew would best satisfy my curiosity

  • What Is Photonic Semiconductor?

    1004 Words  | 3 Pages

    Photonic Semiconductor Abstract- Photonic semiconductor is deeply integrated in electronic circuit designs and widely used in many sorts of applications, they act as electrical to optical or optical to electrical transducers. This paper aims to discuss various optoelectronic devices; their structure, materials, theory of operation, merit properties and characteristics that recommends them for various applications. I. Introduction Optoelectronics is a branch of Photonics Science concerns with devices

  • Flip Flop Case Study

    1346 Words  | 3 Pages

    Saeeid Tahmasbi Oskuii [et al.[1]] titled “Comparative study on low-power high-performance flip-flops” - factors to evaluate the overall performance of the flip flop viz., High speed, low power consumption, robustness and noise stability, small area and less number of transistors, supply voltage scalability, low glitch probability, large internal race immunity, insensitivity to clock edge, insensitivity to process variables, less internal activity when data activity is low.Latches and flip flops

  • Renewable Sources of Energy: Soloar Energy

    873 Words  | 2 Pages

    that is that solar power cannot ever run out as long as it is installed properly. Solar power cells is a source of electrical energy that converts a powerful source of energy such as the sun into electricity, using it’s energy to create electrical currents within the solar panel. Solar panels produce electricity using technology called “Solar Photovoltaic (PV)”. Diagram of how solar panels generally work in a household. URL: http://www.energyfarm.com.au/why-solar-energy-perth/how-does-it-work-solar-power/

  • Essay On Voltage Stability

    603 Words  | 2 Pages

    Voltage stability is defined as the ability of a system to restore steady voltages at all buses in the power system after being exposed by any disturbance from a given initial operating conditions. Voltage stability purely depends on the capability to maintain equilibrium between load supply and load demand from the consumer end. When there will be any progressive fall or rise of voltages of some buses that can cause instability. Power system stability is expressed by the capability of a power system

  • Three Phase Systems Assignment

    1724 Words  | 4 Pages

    Analyse the need for selecting the different voltages used for different parts of the generation, transmission and distribution of electricity. Three Phase Systems Assignment 1 D1 Sean Smith JLR Electricity is the most used source of power in the modern world. We something that is connected too electricity practically all of the time in the modern era from mobile phones to the lighting in our homes. Thinking about where our electricity comes from is something that we never really think about but

  • Electrical Engineering As A Purpose Statement For Electrical Engineering

    608 Words  | 2 Pages

    interest developed in inventions and transformations. Technological innovations have led enormous changes in world and lifestyles. Recent developments in the world have changed the way of generating and using electrical power. I am satisfied with the current opportunities and with my profession. I am looking forward to work in a successful organization and play a significant role in taking it to higher rankings in the world. My interest started developing in the early stage of my life, when I studied

  • Control and Conversion of Electrical Power by Power Semiconductor Devices

    1796 Words  | 4 Pages

    Control and Conversion of Electrical Power by Power Semiconductor Devices Power electronics refers to control and conversion of electrical power by power semiconductor devices wherein these devices operate as switches. Advent of silicon-controlled rectifiers, abbreviated as SCRs, led to the development of a new area of application called the power electronics. Prior to the introduction of SCRs, mercury-arc rectifiers were used for controlling electrical power, but such rectifier circuits were

  • How power produced by a solar cell is affected by its distance from a light source.

    1197 Words  | 3 Pages

    solar cells are moved closer the light source the higher the power they will produce. As light moves away from the source it spreads out at all angles the further you are from the source the less intense the light will be. P = I V Power = current x volts P = FA Power = flux x area Flux = P/A Area of 4 solar cells that I will use is 0.0077m2 This means that the higher the flux the higher the power as we are not changing the area of the solar cells as this remains is constant

  • Rectifier Essay

    1010 Words  | 3 Pages

    rectifier is an electrical device that can converts alternating current into direct current. The process is known as rectification. Rectifiers have many uses, but mostly used as components of DC power supplies and high-voltage direct current power transmission system. Because of the alternating nature of the input AC sine wave, the process of rectification alone produces a DC current that, though unidirectional, consists of pulses of current. Rectifiers have many applications such as power supplies for

  • What is a Power Inverter?

    754 Words  | 2 Pages

    inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).[1] The function of an Inverter is to change the Dc input to a symmetrical AC voltage of desired magnitude and frequency. The output voltage could be fixed or variable at a fixed or variable frequency. A variable output can be obtained by varying the DC input voltage and maintaining the gain of the inverter constant.[2] Voltage and current waveforms produced by inverters are never perfect sinusoids

  • Advantages And Disadvantages Of Inverter

    1232 Words  | 3 Pages

    basic converter types (Pavelka and Čeřovský, 2002). Rectifiers convert an input AC voltage and current to an output DC voltage and current, choppers convert an input DC voltage and current to an output DC voltage and current of different values, inverters convert an input DC voltage and current to an output AC voltage, current, frequency and count of phases, AC converters convert an input voltage, current, count of phases and frequency to an AC energy with different parameters. The frequency converters

  • Technical Benefits Of Controlled Switching

    1446 Words  | 3 Pages

    faulted region of the winding. Therefore, this generated heat will cause the fault to step rapidly to more critical forms, such as phase-to-phase and phase-to-ground faults [59] [60]. The internal short circuit currents of transformer may be larger than its terminal short circuit currents [61]. These faults will result in downtime and financial losses. There are many reasons that lead to internal winding faults such as [62]: a) Failure of winding due to short circuits (turn-turn faults and open

  • Electric Motor Essay

    1788 Words  | 4 Pages

    windings . In any electric motor, operation is based on simple electromagnetism. A current-carrying conductor generates a magnetic field; when this is then placed in an external magnetic field, it will experience a force proportional to the current in the conductor, and to the strength of the external magnetic field. The internal configuration of a DC motor is designed to harness the magnetic interaction between a current-carrying conductor and an external magnetic field to generate rotational motion

  • Schematic Diagram Of The DC Motor

    1368 Words  | 3 Pages

    V = Supply voltage Ia = Armature current Ra = Armature resistance ( = Magnetic flux 7 In reality, the flux and Ra are hard to control. The only parameter that can adjust is the voltage V. As V is increased, the speed of the DC motor also increased. Thus, the speed of the DC motor is directly proportional to the supply voltage, V but inversely proportional to the magnetic flux, (. The Ia is an armature current where it is come from induction. When the magnetic

  • How Solar Energy's are Converted to Electricity?

    570 Words  | 2 Pages

    hits your roof's solar panels with photons (sunlight particles). These photons are converted by solar panel into electrons of direct current (DC) electricity. The electrons flow out of the solar panel into an inverter and other electrical safety devices. The function of an inverter is to convert the "DC" power (which commonly used in batteries) into an alternating current or "AC" power. AC is a kind of electrical power that computer, television and toasters use when plugged into wall outlet. The