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by: Alexis Braun

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# SURVEY OF ELECTRICITY TECH 208

Alexis Braun
Eastern Washington University
GPA 3.67

Staff

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COURSE
PROF.
Staff
TYPE
Class Notes
PAGES
2
WORDS
KARMA
25 ?

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This 2 page Class Notes was uploaded by Alexis Braun on Sunday October 11, 2015. The Class Notes belongs to TECH 208 at Eastern Washington University taught by Staff in Fall. Since its upload, it has received 9 views. For similar materials see /class/221487/tech-208-eastern-washington-university in OTHER at Eastern Washington University.

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Date Created: 10/11/15
Circuit Concepts Chapter I I III Introduction a b There are three basic characteriscs in a circuit i Voltage Current Resistance Four other concepts are important for the study of circuits i Charge Years ago experimentation concluded that when rubbing a glass rod with silk the rod was electrified or charged Now we know that the only thing that is happening is that electrons leaving the glass and entering silk Thus the rod is positively charged The unit of charge is the Coulomb and there is exactly 16x103919 Coulombs per electron Energy Ability to do work ie light a bulb heat a home etc It exists as electrical mechanical heat chemical etc iii Work Transferring or transforming energy Work is done when a force is exerted to move something over a certain distance against opposition Ex An electrical motor used to drive a machine performs work iv Power Rate at which work is done Introduces time into the equation that is how much work is done per second Unit is watt Current a b c 139 i It is concerned with what ows through a circuit Measures the ow of electrons through the wire For every 6242x1018 electrons that pass through a cross section ofa wire we get 1 Ampere of current Note that Q l C 6242x1018 electrons 16x103919 Celectron Why is there no electricity in a copper wire Because when electrons are oating excited by heat in the environment they move at random to both sides thus the average movement of electrons is zero With no external forces applied the net ow of charge in a conductor in any one direction is zero Current ows in wire at 300000 kmsec about 190000 milessec Electrons go from the NEGATIVE terminal to the POSITIVE terminal in a battery There are two ways of writing it i Electron ow negative to positive ii Conventional ow positive to negative Voltage a b Pressure that is applied to electrons so that they can ow through a conductor i Ex Battery Several names for it I may use any of them indistinctly i Voltage ii Electromotive force emf iii Potential 3 1 FD W39Tquot iv Potential difference V I like voltage it is the most common one but I might use ANY Analogy to water ow Voltage Pressure Remember energy is the capacity to do work If a mass is raised to some height above a reference plane it has a measure of potential energy It was the potential to do work such as crushing an object placed on the reference plane If it is increased further it has MORE potential energy In a battery the same thing is happening The chemical action will establish an accumulation of negative charges and positive charges on the positive and negative terminals respectively This results in a potential difference between the terminals This potential difference is what pushes electrons from negative to positive when a conductor connects them both electrons are attracted to the positive terminal The free electrons in the valence shell jump from one atom to the next Remmeber that random movement does NOT create electricity it is ONLY when all electrons go in the same direction that we have a current Short circuit If a wire connects directly two terminals of a battery LARGE amounts of current will ow So high that it will burn Don t do it Open circuit No connection between leads in a battery No current ow Voltage is measured in volts V A potential difference of 1 volt l V eXists between two points if 1 joule J of energy is exchanged in moving 1 coulomb of charge between the two points Resistance i a b c d e f g Opposition to current ow in a circuit Depends on how tightly valence electrons are held Analogy diameter of pipe Larger diameter wire smaller resistance Symbol Q Current though resistor generates heat energy dissipation Reistance depends on i Material of which it is made ii Length of material iii Cross sectional area of material iv Temperature Metals are best many more free electrons More temperature more resistance generally

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