Stray current control of direct currentpowered rail transit systems. The complete electrical troubleshooting program consists of 9 modules individual powerpoint presentations. Sources of emf the source that maintains the current in a closed circuit is called a source of emf. Circuits powered by electrical outlets are ac circuits. Series circuits voltage may be different across different objects in a series circuit. Direct current circuits direct current dc and circuits. View and download powerpoint presentations on alternating current ppt. The current in series circuits is constant throughout but the voltage may vary. Ii alternating current ac with direct current covered and understood it is now time to delve into the world of alternating current. Getting started with basic electronics is easier than you might think.
Direct current circuits fundamental electrical principles 2. E 0 within a conductor current i 0, but not all charges are at rest, free electrons can move v 10 6. Alternating current is when current flows in one direction for a set time, then changes direction, then changes back, and so on in a repeating cycle. This is an original powerpoint animation that demonstrates the different between a series circuit and a parallel circuit. This module describes the basic concepts of direct current dc electrical circuits and discusses the associated terminology. Circuit analysis electrical engineering science khan. Direct current machines electric generators and motors direct current generator voltage values. Parallel circuits are those which branch off from the power supply. Determine if everyday objects are conductors or insulators, and take measurements with an ammeter and voltmeter. Electrical troubleshooting direct current machines. Current and potential difference in circuits draw circuit diagrams with power sources cell, battery or a. Electrical symbols vary from different countries and design platforms but they are more standardized today.
The animation shows what happens when a bulb is removed from e. Download alternating current versus direct ppt for free. This document refers to the training module 6 only. Direct current when the current in a circuit has a constant direction, the current is called direct current most of the circuits analyzed will be assumed to be in. Alper guneren 2010512022 ugur karaali 2010512026 1 2. Physics for scientists and engineers 8ed ch28 powerpoint. Chapter23 alternating current circuits ac circuits resistance capacitance capacitive reactance. A parallel circuit is one that is connected in such a way that the same voltage. Provide return path to the source over the lowest impedance most desirable path possible.
Ppt directcurrent circuits powerpoint presentation. The emf describes the work done per unit charge and has units of volts. Chapter 28 direct current circuits hcc learning web. This is called direct current dc battery powered circuits are dc circuits. The electrical circuit diagram powerpoint template shows a simple illustration of electric circuit symbol elements. The frequency of alternating current is 50hz or 60hz depending upon the country. This is called direct current dc batterypowered circuits are dc circuits. Chapter 25 current, resistance and electromotive force. These symbols are used to create an electrical schematic diagram. Sources of emf a source of emf electromotive force maintains a constant current in a closed circuit. It shows both the standard circuit symbols, as well as pictures, complete with batteries, light bulbs, and wires.
Chapter 25 current, resistance and electromotive force current resistivity resistance electromotive force and circuits energy and power in electric circuits theory of metallic conduction. Henceforth, the conductors that exhibit the property of resisting current flow are called resistors. Calculating resistance, voltage, and current using ohms law. View notes physics for scientists and engineers 8ed ch28 powerpoint slides from phys 2326 at houston community college. Tippens, professor of physics southern polytechnic state university. The potential difference across the resistor would be the same. The history of electricity starts more than two thousand years ago, with the greek philosopher thales being the earliest known researcher into electricity. Electric current, circuit and voltage powerpoint by karen wilson. Ppt electric current and directcurrent circuits powerpoint. A free powerpoint ppt presentation displayed as a flash slide show on. Stray current control of direct currentpowered rail. Ppt direct current circuits powerpoint presentation. Most of the circuits analyzed will be assumed to be in steady state, with constant magnitude and direction. Acdc current ratio in a current superimposition variable flux.
Introduction simple circuits batteries resistors capacitors kirchhoffs rules conservation of energy conservation of charge steadystate circuits. Stray current control of direct currentpowered rail transit. Introduction to circuits and ohms law video khan academy. Power in electric circuits 43 s thorsepower this symbol. The source that maintains the current in a closed circuit is called a source of emf. Ppt directcurrent circuits powerpoint presentation, free. The total current supplied from the power source is divided among each of the branches but voltage is common throughout. Basic laws of circuits kirchhoffs current law the algebraic sum of the currents entering a node equal to zero. History of alternating current william stanley, jr. Circuit analysis is the process of finding all the currents and voltages in a network of connected components. Electrical circuit diagram powerpoint template slidemodel.
These circuit lines run along the sides of the slide, strategically framing the content like a border. Find powerpoint presentations and slides using the power of, find free presentations research about alternating current ppt. Protect signal carrying conductors from interference. An electromotive force device, or emf device, is a source of constant potential. Intro to electricity nyu tandon school of engineering. Alevel physics dc direct current circuits 5 powerpoints.
When the current in a circuit has a constant direction, the current is called direct current. Ch28 direct current circuits to print or download this file, click the link below. Ppt direct current circuits powerpoint presentation, free. To print or download this file, click the link below. This instructable will hopefully demystify the basics of electronics so that anyone with an interest in building circuits can hit the ground running. I direct current dc modern life could not exist if it were not for electricity and electronics. Instructor what we will introduce ourselves to in this video is the notion of electric circuits and ohms law, which you can view as the most fundamental law or the most basic law or simplest law when we are dealing with. This is called direct current dc battery powered circuits.
Sum of the individual voltages source voltage current is the same in all parts of a series circuit. Direct current dc is the unidirectional flow of an electric charge. Chapter vii direct current circuits free download as powerpoint presentation. A direct current circuit is an electrical circuit that consists of any combination of constant. For devices in your home that operate on direct current, like a flat screen tv, an ac to dc adapter is used to convert the alternating current from a wall outlet to direct current for the device. A guidebook allows transit agencies, design, and maintenance practitioners to influence new system construction, extensions, and maintenance and operation of existing systems. Resistors in series since these resistors are in series, we have the same current in all three resistors we also have that the sum of the potential differences across the three. Chapter ac alternating current circuits page 4 answer to essential question ac. Resistors in series and parallel as with capacitors, resistors are often in series and parallel configurations in circuits series parallel the question then is what is the equivalent resistance.
Build circuits with batteries, resistors, light bulbs, fuses, and switches. Electric current high current and low current electric circuit voltage high voltage and lo. A free powerpoint ppt presentation displayed as a flash slide show on id. Adding resistance in series decreases total current dimmer light bulbs parallel circuits. Mar 27, 2017 for devices in your home that operate on direct current, like a flat screen tv, an ac to dc adapter is used to convert the alternating current from a wall outlet to direct current for the device. Tippens, professor of physics southern polytechnic state university a powerpoint presentation by paul e. All currents return to their sources following path of least impedance. User conducting connections wires direct current circuits. This behavior of materials is often used to controllimit electric current flow in circuits. Two basic laws that describe the performance of electric circuits are ohms law and kirchhoffs circuit rules. This 11 slide powerpoint includes definitions, examples, videos and demonstrations. By using a single set of coils, the structure is simplified.
Generators batteries neglect internal resistance r. Circuit closed loop in which current can flow basic simple circuit voltage source voltage uses conducting connections wire. The connection between the supply and the load is made by soldering with wires that are often called leads, or with many kinds of connectors and terminals. Rms values since voltage and current are always changing we need some way of averaging out their effect.
Sep 02, 2008 direct current circuits fundamental electrical principles 2. Jul 25, 2016 this is a bundle of the five lessons, complete with full lesson plans, curriculum links, powerpoints and practical ideas for the chapter on dc circuits read more. We look at the basic elements used to build circuits, and find out what happens when elements are connected together into a circuit. Rc circuits according to kirchoffs 2nd rule we have using a counterclockwise loop 0 0.
The trb transit cooperative research programs tcrp research report 212. The circuit powerpoint template is a clean, sophisticated and ultramodern template that you can use for presentations about technology and circuitry. Chapter vii direct current circuits electrical resistance. Ppt series and parallel circuits powerpoint presentation free to.
Electron pump battery device that reduces potential. The terminal voltage is the accessible external voltage. In this chapter we will explore circuits with batteries, resistors, and capacitors in this course, we will only consider. Physics 231 lecture 62 fall 2008 resistors in series and parallel as with capacitors, resistors are often in series and parallel configurations in circuits series parallel the question then is what is the equivalent resistance. Chapter 28a direct current circuits a powerpoint presentation by paul e. With the current increasing instead of decreasing, however, the potential difference across the inductor would have the same magnitude as before, but the left end of the inductor would. Electric current, circuit and voltage powerpoint by karen. Circuit symbols three types of circuits series parallel compound series circuits series circuits have 1 path for charges to flow. It reverses its direction while flowing in a circuit. Power point covering current voltage and resistance. Any devices that increase the potential energy of charges. The battery emf is the voltage produced internally. Series circuits are those which are connected inline with the power source. Electric current and directcurrent circuits powerpoint ppt presentation.
Stray current control of direct current powered rail transit systems. The magnitude of resistance is dictated by electric properties of the material and material geometry. Volume 2 of 4 module 3 dc circuits this module introduces the rules associated with the reactive components of inductance and capacitance and how they affect dc circuits. Solving for the current as time increases, the charge on the capacitor increases, therefore the current in the circuit decreases current will flow until the capacitor has a charge on. View the circuit as a schematic diagram, or switch to a lifelike view. Electrical troubleshooting direct current machines powerpoint. Ohms law with voltage steady, changes in current and resistance 2. For simple simple and complex complex circuits, determine the voltage and and current current for each resistor. Ppt direct current circuits powerpoint presentation free. Direct current dc where electrons flow in the same direction.
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