logging in or signing up Circuit Elements; Ohm's Law; KCL;KVL sfaizi Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 481 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: February 14, 2013 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Circuit Elements; Ohm's Law; KCL;KVL: Circuit Elements; Ohm's Law; KCL;KVL Presented by:- MOHD.SHADAN FAIZI MOHD.WAQUAR HASAN ABHISHEK SHARMA MOHD.NAZIM LOKESH SHARMA Presented to:- Dr.G.CHITRABasic Electrical Quantities: Basic quantities: current, voltage and power Current : time rate of change of electric charge I = dq / dt 1 Amp = 1 Coulomb/sec Voltage : electromotive force or potential, V 1 Volt = 1 Joule/Coulomb = 1 N ·m/coulomb Power : P = I V 1 Watt = 1 Volt · Amp = 1 Joule/sec Basic Electrical QuantitiesCurrent, I: Normally we talk about the movement of positive charges although we know that, in general, in metallic conductors current results from electron motion (conventionally positive flow) The sign of the current indicates the direction of flow Types of current: direct current (dc): batteries and some special generators alternating current (ac): household current which varies with time Current, I I( t )Voltage, V: Voltage is the difference in energy level of a unit charge located at each of two points in a circuit, and therefore, represents the energy required to move the unit charge from one point to the other Voltage, V Circuit Element(s) + – V(t)Default Sign Convention: Passive sign convention : current should enter the positive voltage terminal Consequence for P = I V Positive (+) Power: element absorbs power Negative (-) Power: element supplies power Default Sign Convention Circuit Element + – IElectrical Analogies (Physical): Electrical Analogies (Physical)Active vs. Passive Elements: Active elements can generate energy Voltage and current sources Batteries Passive elements cannot generate energy Resistors Capacitors and Inductors (but CAN store energy) Active vs. Passive ElementsIndependent Sources: An independent source (voltage or current) may be DC (constant) or time-varying (AC), but does not depend on other voltages or currents in the circuit Independent Sources + – Voltage Source Current SourceResistors: A resistor is a circuit element that dissipates electrical energy (usually as heat) Real-world devices that are modeled by resistors: incandescent light bulbs, heating elements (stoves, heaters, etc.), long wires Resistance is measured in Ohms ( Ω ) ResistorsOhm’s Law: v(t) = i(t) R - or - V = I R p(t) = i 2 (t) R = v 2 (t)/R [+ (absorbing)] Ohm’s Law v ( t ) The Rest of the Circuit R i ( t ) + –Open Circuit: What if R = ? i(t) = v(t)/R = 0 Open Circuit v ( t ) The Rest of the Circuit i ( t )=0 + – i ( t )=0Short Circuit: What if R = 0 ? v(t) = R i(t) = 0 Short Circuit The Rest of the Circuit v ( t )=0 i ( t ) + –Series: Two elements are in series if the current that flows through one must also flow through the other. Series R 1 R 2 Series R 1 R 2 Not SeriesParallel: Two elements are in parallel if they are connected between (share) the same two (distinct) end nodes. Parallel Parallel Not Parallel R 1 R 2 R 1 R 2Kirchhoff’s Laws: Kirchhoff’s Current Law (KCL) sum of all currents entering a node is zero sum of currents entering node is equal to sum of currents leaving node Kirchhoff’s Voltage Law (KVL) sum of voltages around any loop in a circuit is zero Kirchhoff’s LawsKCL (Kirchhoff’s Current Law): The sum of currents entering the node is zero: Analogy : mass flow at pipe junction KCL (Kirchhoff’s Current Law) i 1 ( t ) i 2 ( t ) i 4 ( t ) i 5 ( t ) i 3 ( t )KVL (Kirchhoff’s Voltage Law): The sum of voltages around a loop is zero: Analogy : pressure drop thru pipe loop KVL (Kirchhoff’s Voltage Law) v 1 ( t ) + + – – v 2 ( t ) v 3 ( t ) + – You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.