- published: 15 Jan 2014
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Direct current (DC) is the unidirectional flow of electric charge. Direct current is produced by sources such as batteries, power supplies, thermocouples, solar cells, or dynamos. Direct current may flow in a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current.
The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.
Direct current may be obtained from an alternating current supply by use of a rectifier, which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction. Direct current may be converted into alternating current with an inverter or a motor-generator set.
Direct current is used to charge batteries and as power supply for electronic systems. Very large quantities of direct-current power are used in production of aluminum and other electrochemical processes. It is also used for some railways, especially in urban areas. High-voltage direct current is used to transmit large amounts of power from remote generation sites or to interconnect alternating current power grids.
Electricity video #2. Explaining the difference between Direct Current and Alternating Current. Thank you too: PhET Interactive Simulations, University of Colorado, their link is posted below. These are amazing to use within classrooms. http://phet.colorado.edu/
Twitter: @addohms Web: www.addohms.com Just what the heck is the difference between "AC" and "DC? And if the "C" stands for "current", then why do people say 120VAC? This video takes a look at both AC and DC using simple example circuits for each. Previous video mention: http://www.youtube.com/watch?v=lYZUXV-v71Y
Videos supplement material from the textbook Physics for Engineers and Scientist by Ohanian and Markery (3rd. Edition) (http://books.wwnorton.com/books/Physics-for-Engineers-and-Scientists/) Feel free to post questions and/or suggestions in the comments and I'll respond if possible. The videos are mostly for my students, but since others seem to find them useful I'll help as much as I possibly can!
Help us to make future videos for you. Make LE's efforts sustainable. Please support us at Patreon.com ! https://www.patreon.com/LearnEngineering The working of a DC motor is well explained in this video with the help of animation. Construction details of DC Motor, Shunt & Series motor, concept of back EMF are also explained in this video.
This animation contrasts the motion of conventional charge in AC and DC circuits.
The story about why DC power systems are returning to common use and how it is happening.
This video explains the difference between direct current and alternating current in terms of electric current and electric energy. In this video "electric energy" is synonymous with voltage, as voltage is closely related to energy. See "Electric Potential" and "Electric Potential Energy" on Wikipedia. Also, this video shows electric current, not conventional current.
See more videos at: http://talkboard.com.au/ In this video, we look at the difference between AC and DC power and what root-mean square (RMS) voltage and current means.
Boom Beach "Direct Current" Base Level 48 conquer. By Tmed player lvl 44. Tanks - lvl 7, Medics - lvl 2, Gunboat energy : 42 + 6 (statue 12% bonus) = 48. Troop Damage : +31%, Troop Health: + 34%. ************************************************************* I'm not pretending that this is the best solution. Just show it for Tmed preferenced players how it can be completed.
GCSE Physics Revision: Direct current and alternating current You can watch all my videos at www.freesciencelessons.co.uk In this video, we look at direct current (DC) and alternating current (AC). We learn how to use an oscilloscope to work out features of an alternating current and yes, the examiners do love this topic.
Created with Wondershare Filmora Reference List Macao.communications.museum. (2016). Inductor in a DC Circuit. [online] Available at: http://macao.communications.museum/eng/exhibition/secondfloor/MoreInfo/2_3_6_ResistanceInductance.html [Accessed 14 Oct. 2016]. Macao.communications.museum. (2016). Direct Current Circuit. [online] Available at: http://macao.communications.museum/eng/exhibition/secondfloor/MoreInfo/2_3_1_DCCircuit.html [Accessed 14 Oct. 2016]. HowStuffWorks. (2000). How Inductors Work. [online] Available at: http://electronics.howstuffworks.com/inductor2.htm [Accessed 14 Oct. 2016]. Electrical4u.com. (2016). What is Inductor and Inductance | Theory of Inductor | Electrical4u. [online] Available at: http://www.electrical4u.com/what-is-inductor-and-inductance-theory-of-...
Alternating current (AC) is used for power line transmission and for high power devices like appliances and lights. The characteristics of AC make it ideal for transmission over long lines and for delivering large amounts of power for relatively unregulated uses, such as generating heat and light. Lower power appliances and devices require the closely regulated control of direct current power (DC). As a normal house is supplied with AC, it must be converted to DC for many uses. Use these tips to learn how to make an AC DC converter.
A High-Voltage Direct Current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power, in contrast with the more common alternating current (AC) systems. For long-distance transmission, HVDC systems may be less expensive and suffer lower electrical losses. For underwater power cables, HVDC avoids the heavy currents required to charge and discharge the cable capacitance each cycle. For shorter distances, the higher cost of DC conversion equipment compared to an AC system may still be warranted, due to other benefits of direct current links. HVDC allows power transmission between unsynchronized AC transmission systems. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it ca...
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how to replace each part of motor...replace its connecting pins THANKS FOR WACHING. For More Video Subscribe Google Plus+: https://plus.google.com/b/11160454391...
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In this talk at the Summit on Transcranial Direct Current Stimulation (tDCS) at the UC-Davis Center for Mind & Brain, Dr. Roy Hamilton, Assistant Professor of Neurology at the University of Pennsylvania, discusses a range of clinical applications of the transcranial direct current stimulation (tDCS) technique.
Urban Frontier House: Direct-Current Microgrid Randy Hafer of High Plains Architects discusses the ongoing "Urban Frontier House" project in Billings, Montana, during the 2015 Harvesting Clean Energy Conference. The house, a step toward an off-the-grid house in an urban environment, is super insulated, has solar panels, and an "urban turban" wind generator. The generator is manufactured by a Japanese company and is one of the first in the country. The home also has a Direct Microgrid, and a water-capture system. Hafer discusses the process of building the home, including the positive reaction of the neighbors in the mixed-income neighborhood.
2016 Week 2 Philadelphia Spinners @ DC Current Follow the DC Current: http://www.WashingtonDCCurrent.com http://facebook.com/WashingtonDCCurrent http://twitter.com/theDCCurrent
Join our hosts, Matt Dozier and Allison Lantero, as they investigate the sneaky "soft costs" that are a big chunk of rooftop solar prices, delve into the archives for a look at the turbulent times around the Energy Department's creation, and contemplate some alternatives to the name "Direct Current." To subscribe using iTunes, https://itunes.apple.com/us/podcast/direct-current-energy.gov/id1110797865 To subscribe using another podcatcher, copy this URL: http://energy.gov/podcasts/direct-current-energygov-podcast?format=itunes Contact directcurrent@hq.doe.gov --- Subscribe so you don't miss a video http://youtube.com/energygov Check out our cool pics on http://instagram.com/energy More to Learn on http://Facebook.com/energygov Keep up with the Tweets at http://twitter.com/ENERGY
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Dr. Marom Bikson, Associate Professor of Biomedical Engineering at The City College of The City University of New York, discussing the cellular mechanisms of transcranial direct current stimulation (tDCS) at the Summit on Transcranial Direct Current Stimulation (tDCS) at the UC-Davis Center for Mind & Brain.
Direct Current And Alternating Current MOTORS AND GENERATORS How Do They Work