GLE 594: An introduction to applied geophysics
|
|
- Cori Shanon Phillips
- 6 years ago
- Views:
Transcription
1 GLE 594: An introduction to applied geophysics Electrical Resistivity Methods Fall 2004 Earth Properties and Basic Theory Reading Today : Next Lecture :
2 Introduction Link resistivity (ability of the earth to conduct an electric current) to subsurface structure. Useful because resistivity of earth materials varies by around 10 orders of magnitude. Developed by Conrad Schlumberger (France) and Frank Wenner (United States) in early 20th century. Uses: Archeology, Environmental, Mineral exploration Electricity Basics Voltage V - Electrical potential energy per unit charge [volts] Current i - amount of charge per unit time [amperes] i 1 R V Resistivity R is just a proportionality constant [ohms] R relates current I to voltage I. However, no units of length in this form of Ohm s law. 2
3 Resistivity Resistance includes length and area We want resisitivity ρ [ohm/m] because - property of the material alone. - no geometry included R ρ L A [ ohm] length resistance area resistance Conductivity σ [siemens/m] or [mhos/m]: 1 [ mhos m] σ ρ It is the ability of the electrical charge to move through the material Electrical Conductivity of Geomaterials Non-conductive minerals Electric field Electric field Hydrated ion mobility Double layer surface conduction Electrolyte Soil (Archie s law) Soil (clays) σ σ el soil Equation ms mg [ ] 0.15TDS[ ] m σ soil aσ nσ + el c el Sr n m L ( 1 n) ΘρgSs Comments TDS: total dissolved salts a 1; m~1-2.4; c~4-5 Θ 10-9 S (for Kaolinite) 3
4 Non-conductive Minerals 4
5 Analogous to Heat and Fluid Flow Any solutions you know for one of these flows works for the others with the analogous boundary and initial conditions. (Wang and Anderson 1982) Earth as a Circuit Soils and rocks can be conceptually modeled as a circuit made of a resistor, capacitor, inductor and battery: R C L B Electrodes Resistor R: Capacitor C: Inductor L: Battery B: dissipator of applied energy as heat storage of energy as separation of charges self voltage associated to electromagnetic methods electrokinetics and self-potentials 5
6 Current Source on Surface Electric potential at distance away from current source on surface given as V(r)ρI/2πr. How? Boundary conditions: 1)As r >, V > 0. 2) V is continuous across any boundary 3) Tangential E continuous across any boundary 4) Normal I continuous across any boundary. 5) Above leads to no vertical current crossing earth-air interface. Current Flow in a Homogeneous and Isotropic Medium Point Current Source: dv ir shell l A dr 2πr 2 Voltage decreases as the inverse of the distance from the current source. Shape of constant voltages are hemispheres for a single point source. V D 2π D dv 2π ( 1) 1 D dr 2 r 2π 1 D 2πD ( 1) 1 r D 6
7 Two Current Electrodes: Source and Sink Why run an electrode to infinity when we can use it? source sink r source P V source r sink 2πr source V sin k 2πr sink Total Voltage at P: V p V source V sin k 1 2π r source 1 r sink Measurement Practicalities Can t measure potential at single point unless the other end of our volt meter is at infinity. This is inconvenient. It is easier to measure potential difference ( V). This lead to use of four electrode array for each measurement. ρ Resulting measurement given as VV P1 -V P2 ρi/(2π)*(1/r 1-1/r 2-1/r 3 +1/r 4 ). Can be rewritten VρI*G/(2π) where G/2π is the Geometrical Factor of the array. 7
8 Current density and equipotential lines for a current dipole d fraction total current i f 2 2z π tan 1 d i f 0.5 at i f 0.7 at z d 2 z d Wider spacing Deeper currents Apparent Resistivity Previous expression can be rearranged in terms of resistivity: ρ( V/I) (2π/G). ρ 1 This can be done even when medium is inhomogeneous. Result is then referred to as Apparent Resistivity. ρ 2 Definition:Resistivity of a fictitious homogenous subsurface that would yield the same voltages as the earth over which measurements were actually made. 8
9 Geometrical Factors Array advantages and disadvantages Array Wenner Schlumberger Dipole-Dipole Advantages 1. Easy to calculate ρ a in the field 2. Less demand on instrument sensivity 1. Fewer electrodes to move each sounding 2. Needs shorter potential cables 1. Cables can be shorter for deep soundings Disadvantages 1. All electrodes moved each sounding 2. Sensitive to local shallow variations 3. Long cables for large depths 1. Can be confusing in the field 2. Requires more sensitive equipment 3. Long Current cables 1. Requires large current 2. Requires sensitive instruments 9
Electrical prospecting involves detection of surface effects produced by electrical current flow in the ground.
Electrical Surveys in Geophysics Electrical prospecting involves detection of surface effects produced by electrical current flow in the ground. Electrical resistivity method Induced polarization (IP)
More informationEnvironmental and Exploration Geophysics I. Resistivity II tom.h.wilson
Environmental and Exploration Geophysics I Resistivity II tom.h.wilson tom.wilson@mail.wvu.edu Department of Geology and Geography West irginia University Morgantown, W For next class complete in-class
More information1. Resistivity of rocks
RESISTIVITY 1) Resistivity of rocks 2) General principles of resistivity surveying 3) Field procedures, interpretation and examples 4) Summary and conclusions INDUCED POLARIZATION 1) General principles
More informationEnvironmental and Exploration Geophysics I. Resistivity II tom.h.wilson
Environmental and Exploration Geophysics I Resistivity II tom.h.wilson tom.wilson@mail.wvu.edu Department of Geology and Geography West irginia University Morgantown, W Objectives for the day Review basic
More informationGeology 228/378 Applied and Environmental Geophysics Lecture 6. DC resistivity Surveys
Geology 228/378 Applied and Environmental Geophysics Lecture 6 DC resistivity Surveys Direct current (DC) Resistivity. Introduction 2. Current flow in the ground 3. Schlumberger, Wenner, dipole-dipole,
More informationElectrical Surveying (part A)
Electrical Surveying (part A) Dr. Laurent Marescot Course given at the University of Fribourg (2009) Contact: laurent@tomoquest.com www.tomoquest.com 1 Introduction Electrical surveying Resistivity method
More informationand in a simple circuit Part 2
Current, Resistance, and Voltage in a simple circuit Part 2 Electric Current Whenever electric charges of like signs move, an electric current is said to exist. Look at the charges flowing perpendicularly
More informationGeophysics Course Introduction to DC Resistivity
NORAD supported project in MRRD covering Capacity Building and Institutional Cooperation in the field of Hydrogeology for Faryab Province Afghanistan Geophysics Course Introduction to DC Resistivity By
More informationElectrical Methods. Resistivity Surveying
Electrical Methods Resistivity Surveying Geologic Resistivity 1101 Resistivity surveying investigates variations of electrical resistance, by causing an electrical current to flow through the subsurface
More informationLecture #3. Review: Power
Lecture #3 OUTLINE Power calculations Circuit elements Voltage and current sources Electrical resistance (Ohm s law) Kirchhoff s laws Reading Chapter 2 Lecture 3, Slide 1 Review: Power If an element is
More information4.6 DC resistivity and IP field systems, data processing and interpretation
4.6 DC resistivity and P field systems, data processing and interpretation Electrode arrays Response of a layered earth The anisotropic half space Response of simple inhomogeneities Solutions for arbitrary
More informationCONTENTS 1. INTRODUCTION. 2. THE D.C. RESISTIVITY METHOD 2.1 Equipment 2.2 Survey Procedure 2.3 Data Reduction
(i) CONTENTS 1. INTRODUCTION page 1 2. THE D.C. RESISTIVITY METHOD 2.1 Equipment 2.2 Survey Procedure 2.3 Data Reduction 3 3 3 3 3. GEOPHYSICAL RESULTS 3.1 General 3.2 Discussion 4 4 4 4. LIMITATIONS 5
More informationGeoelectricity. ieso 2010
Geoelectricity ieso 2010 1 RESISTIVITY SURVEY AT VENETO VILLA GRITTI AT THE TOWN OF TREVISO (VENETO REGION) The survey was carried out to verify the underground presence of the fondations of a rustic building.
More informationDefinition. Useful References
Introduction to Geophysics Short Course Assignments http://www.mines.edu/fs_home/tboyd/gp311/modules/res/main.html Definition Resistivity Method - Observation of electric fields caused by current introduced
More informationธรณ ฟ ส กส อ.ดร. ส ว มล อ ดพ วย
205482 Geophysics ธรณ ฟ ส กส อ.ดร. ส ว มล อ ดพ วย E-mail: suwimons@hotmail.com Office: GB111-4 ภาคว ชาธรณ ว ทยา คณะว ทยาศาสตร มหาว ทยาล ยเช ยงใหม มหาวทยาลยเชยงใหม GEOPHYSICS Physics of the earth = applies
More informationI) Resistivity. Literatur: Telford, Geldart und Sheriff (1990): Applied Geophysics, Second Edition, Cambridge University Press, NY.
I) Resistivity Literatur: Telford, Geldart und Sheriff (1990): Applied Geophysics, Second Edition, Cambridge University Press, NY. Bender, F. (Hg.) (1985): Angewandte Geowissenschaften, Bd. II, Enke Verlag,
More informationIntroduction. Electrical surveying. Resistivity method Induced polarization method (IP) Self-potential (SP) method
Introduction Electrical surveying Resistivity method Induced polarization method (IP) Self-potential (SP) method Higher frequency methods (electromagnetic surveys): Electromagnetic induction methods Ground
More informationShort guide for resistivity and induced polarization tomography
Short guide for resistivity and induced polarization tomography Address of the manufacturer: GF Instruments, s.r.o. Purkyňova 144 61200 Brno tel: +420 549 522 919 fax: +420 549 522 915 e-mail: info@gfinstruments.cz
More informationMechanism of electric conductance in crystals
Mechanism of electric conductance in crystals 1 Electric current in conductors A When the conductor is in electric field, the field accelerates free electrons Electrons moving (drifting) in electric field
More informationCURRENT ELECTRICITY CHAPTER 13 CURRENT ELECTRICITY Qs. Define Charge and Current. CHARGE Definition Flow of electron is known as Charge. It is denoted by Q. Unit Its unit is Coulomb. 1 Coulomb = 10(-6)
More informationPart II: Self Potential Method and Induced Polarization (IP)
Part II: Self Potential Method and Induced Polarization (IP) Self-potential method (passive) Self-potential mechanism Measurement of self potentials and interpretation Induced polarization method (active)
More informationGLE 594: An introduction to applied geophysics
GLE 594: An intoduction to applied geophsics Electical Resistivit Methods Fall 4 Theo and Measuements Reading: Toda: -3 Net Lectue: 3-5 Two Cuent Electodes: Souce and Sink Wh un an electode to infinit
More informationReview. Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
Review Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. When more devices are added to a series circuit, the total circuit resistance: a.
More informationHandout 10: Inductance. Self-Inductance and inductors
1 Handout 10: Inductance Self-Inductance and inductors In Fig. 1, electric current is present in an isolate circuit, setting up magnetic field that causes a magnetic flux through the circuit itself. This
More informationChapter 17. Current and Resistance. Sections: 1, 3, 4, 6, 7, 9
Chapter 17 Current and Resistance Sections: 1, 3, 4, 6, 7, 9 Equations: 2 2 1 e r q q F = k 2 e o r Q k q F E = = I R V = A L R ρ = )] ( 1 [ o o T T + = α ρ ρ V I V t Q P = = R V R I P 2 2 ) ( = = C Q
More informationVertical Electrical Sounding (Ves) For The Determination Of Under Ground Resistivity In Part Of Nigeria Wilberforce Island,Amassoma, Bayelsa State
IOSR Journal of Research & Method in Education (IOSR-JRME) e-issn: 2320 7388,p-ISSN: 2320 737X Volume 7, Issue 2 Ver. III (Mar. - Apr. 2017), PP 53-61 www.iosrjournals.org Vertical Electrical Sounding
More informationELECTRICAL PROSPECTING METHODS
Suez Canal University Faculty of Science Department of Geology ELECTRICAL PROSPECTING METHODS Prepared By El-Arabi Hendi Shendi Professor of applied & environmental Geophysics 2008 1 CONTENTS Definitions
More informationCoulomb s constant k = 9x10 9 N m 2 /C 2
1 Part 2: Electric Potential 2.1: Potential (Voltage) & Potential Energy q 2 Potential Energy of Point Charges Symbol U mks units [Joules = J] q 1 r Two point charges share an electric potential energy
More informationCurrent and Resistance
Current and Resistance 1 Define the current. Understand the microscopic description of current. Discuss the rat at which the power transfer to a device in an electric current. 2 2-1 Electric current 2-2
More informationEXP. NO. 3 Power on (resistive inductive & capacitive) load Series connection
OBJECT: To examine the power distribution on (R, L, C) series circuit. APPARATUS 1-signal function generator 2- Oscilloscope, A.V.O meter 3- Resisters & inductor &capacitor THEORY the following form for
More informationPhysics 2020 Exam 2 Constants and Formulae
Physics 2020 Exam 2 Constants and Formulae Useful Constants k e = 8.99 10 9 N m 2 /C 2 c = 3.00 10 8 m/s ɛ = 8.85 10 12 C 2 /(N m 2 ) µ = 4π 10 7 T m/a e = 1.602 10 19 C h = 6.626 10 34 J s m p = 1.67
More informationVersion 001 CIRCUITS holland (1290) 1
Version CIRCUITS holland (9) This print-out should have questions Multiple-choice questions may continue on the next column or page find all choices before answering AP M 99 MC points The power dissipated
More informationUniversity Physics (PHY 2326)
Chapter 25 University Physics (PHY 2326) Lecture 7 Electrostatics and electrodynamics Capacitance and capacitors capacitors with dielectrics Electric current current and drift speed resistance and Ohm
More informationCircuit Analysis-II. Circuit Analysis-II Lecture # 5 Monday 23 rd April, 18
Circuit Analysis-II Capacitors in AC Circuits Introduction ü The instantaneous capacitor current is equal to the capacitance times the instantaneous rate of change of the voltage across the capacitor.
More informationChapter 1 The Electric Force
Chapter 1 The Electric Force 1. Properties of the Electric Charges 1- There are two kinds of the electric charges in the nature, which are positive and negative charges. - The charges of opposite sign
More informationFlow Rate is the NET amount of water passing through a surface per unit time
Electric Current An Analogy Water Flow in a Pipe H 2 0 gallons/minute Flow Rate is the NET amount of water passing through a surface per unit time Individual molecules are bouncing around with speeds of
More informationSurface and borehole electrical resistivity tomography
Surface and borehole electrical resistivity tomography Laurent Marescot laurent@tomoquest.com Introduction Surface electrical resistivity surveying is based on the principle that the distribution of electrical
More informationTexas A & M University Department of Mechanical Engineering MEEN 364 Dynamic Systems and Controls Dr. Alexander G. Parlos
Texas A & M University Department of Mechanical Engineering MEEN 364 Dynamic Systems and Controls Dr. Alexander G. Parlos Lecture 5: Electrical and Electromagnetic System Components The objective of this
More informationGeophysics Course Interpreting DC Resistivity Data
NORAD supported project in MRRD covering Capacity Building and Institutional Cooperation in the field of Hydrogeology for Faryab Province Afghanistan Geophysics Course Interpreting DC Resistivity Data
More informationr where the electric constant
1.0 ELECTROSTATICS At the end of this topic, students will be able to: 10 1.1 Coulomb s law a) Explain the concepts of electrons, protons, charged objects, charged up, gaining charge, losing charge, charging
More informationPart IB Electromagnetism
Part IB Electromagnetism Theorems Based on lectures by D. Tong Notes taken by Dexter Chua Lent 2015 These notes are not endorsed by the lecturers, and I have modified them (often significantly) after lectures.
More informationr where the electric constant
0. Coulomb s law a) Explain the concepts of electrons, protons, charged objects, charged up, gaining charge, losing charge, grounding and charge conservation. b) Describe the motion of point charges when
More informationElectric Currents & Resistance
Electric Currents & Resistance Electric Battery A battery produces electricity by transforming chemical energy into electrical energy. The simplest battery contains two plates or rods made of dissimilar
More informationELECTRICITY. Electric Circuit. What do you already know about it? Do Smarty Demo 5/30/2010. Electric Current. Voltage? Resistance? Current?
ELECTRICITY What do you already know about it? Voltage? Resistance? Current? Do Smarty Demo 1 Electric Circuit A path over which electrons travel, out through the negative terminal, through the conductor,
More informationChapter 2. Engr228 Circuit Analysis. Dr Curtis Nelson
Chapter 2 Engr228 Circuit Analysis Dr Curtis Nelson Chapter 2 Objectives Understand symbols and behavior of the following circuit elements: Independent voltage and current sources; Dependent voltage and
More informationElectric Current. Chapter 17. Electric Current, cont QUICK QUIZ Current and Resistance. Sections: 1, 3, 4, 6, 7, 9
Electric Current Chapter 17 Current and Resistance Sections: 1, 3, 4, 6, 7, 9 Whenever electric charges of like signs move, an electric current is said to exist The current is the rate at which the charge
More informationAP Physics C Electricity & Magnetism Mid Term Review
AP Physics C Electricity & Magnetism Mid Term Review 1984 37. When lighted, a 100-watt light bulb operating on a 110-volt household circuit has a resistance closest to (A) 10-2 Ω (B) 10-1 Ω (C) 1 Ω (D)
More informationMixing Problems. Solution of concentration c 1 grams/liter flows in at a rate of r 1 liters/minute. Figure 1.7.1: A mixing problem.
page 57 1.7 Modeling Problems Using First-Order Linear Differential Equations 57 For Problems 33 38, use a differential equation solver to determine the solution to each of the initial-value problems and
More information2. Basic Components and Electrical Circuits
1 2. Basic Components and Electrical Circuits 2.1 Units and Scales The International System of Units (SI) defines 6 principal units from which the units of all other physical quantities can be derived
More information325 C3 Electric current flow in a two-layer Earth
35 C3 Electric current flow in a two-layer Earth C3.1 The effect of an interface To compute the apent resistivity of a multi-layer Earth, we must consider what will happen when electric current crosses
More informationPhysics 202: Lecture 5, Pg 1
Resistance Resistors Series Parallel Ohm s law Electric Circuits Current Physics 132: Lecture e 15 Elements of Physics II Kirchhoff s laws Agenda for Today Physics 202: Lecture 5, Pg 1 Electric Current
More informationLecture 1. Electrical Transport
Lecture 1. Electrical Transport 1.1 Introduction * Objectives * Requirements & Grading Policy * Other information 1.2 Basic Circuit Concepts * Electrical l quantities current, voltage & power, sign conventions
More informationElectric Charge and Electric field
Electric Charge and Electric field ConcepTest 16.1a Electric Charge I Two charged balls are repelling each other as they hang from the ceiling. What can you say about their charges? 1) one is positive,
More informationPhysics for Scientists & Engineers 2
Review The resistance R of a device is given by Physics for Scientists & Engineers 2 Spring Semester 2005 Lecture 8 R =! L A ρ is resistivity of the material from which the device is constructed L is the
More informationAlternating Current. Chapter 31. PowerPoint Lectures for University Physics, Twelfth Edition Hugh D. Young and Roger A. Freedman
Chapter 31 Alternating Current PowerPoint Lectures for University Physics, Twelfth Edition Hugh D. Young and Roger A. Freedman Lectures by James Pazun Modified by P. Lam 8_8_2008 Topics for Chapter 31
More informationGroundwater Sustainability at Wadi Al Bih Dam, Ras El Khaimah, United Arab Emirates (UAE) using Geophysical methods
Groundwater Sustainability at Wadi Al Bih Dam, Ras El Khaimah, United Arab Emirates (UAE) using Geophysical methods Ahmed Murad, Amir Gabr, Saber Mahmoud, Hasan Arman & Abdulla Al Dhuhoori Geology Department
More informationPHYSICS 171. Experiment 3. Kirchhoff's Laws. Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm).
PHYSICS 171 Experiment 3 Kirchhoff's Laws Equipment: Supplies: Digital Multimeter, Power Supply (0-20 V.). Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm). A. Kirchhoff's Loop Law Suppose that
More informationAnnouncements: Today: more AC circuits
Announcements: Today: more AC circuits I 0 I rms Current through a light bulb I 0 I rms I t = I 0 cos ωt I 0 Current through a LED I t = I 0 cos ωt Θ(cos ωt ) Theta function (is zero for a negative argument)
More informationExam 2 Solutions. = /10 = / = /m 3, where the factor of
PHY049 Fall 007 Prof. Yasu Takano Prof. Paul Avery Oct. 17, 007 Exam Solutions 1. (WebAssign 6.6) A current of 1.5 A flows in a copper wire with radius 1.5 mm. If the current is uniform, what is the electron
More informationMOUNT POLLEY MINING CORPORATION TECHNICAL REPORT ON MULTI-ELECTRODE RESISTIVITY AND SEISMIC REFRACTION SURVEYS MOUNT POLLEY TAILINGS DAM PROJECT
MOUNT PLEY MINING CORPORATION TECHNICAL REPORT ON MULTI-ELECTRODE RESISTIVITY AND SEISMIC REFRACTION SURVEYS MOUNT PLEY TAILINGS DAM PROJECT LIKELY, B.C. by Claudia Krumbiegel, M.Sc. Cliff Candy, P.Geo.
More informationGeophysical Investigation: A Case Study of Basement Complex, Nigeria
Geophysical Investigation: A Case Study of Basement Complex, Nigeria Adiela U.P 1, Ayodele Moses Oyewole 2 and Omoirabor Omoleomo 3 1 Department of Petroleum Engineering, Nigerian Agip Oil Company, Port
More informationPhysics for Scientists & Engineers 2
Electromagnetic Oscillations Physics for Scientists & Engineers Spring Semester 005 Lecture 8! We have been working with circuits that have a constant current a current that increases to a constant current
More informationChapter 18. Direct Current Circuits -II
Chapter 18 Direct Current Circuits -II So far A circuit consists of three-four elements: Electromotive force/power supply/battery capacitors, resistors inductors Analyzed circuits with capacitors or resistors
More informationGeophysics of Exploration for Water. Geoelectric methods III. edited by Peter Vass
Geophysics of Exploration for Water Geoelectric methods III edited by Peter Vass The phenomenon of induced polarization was already noticed at the early stage of applying direct current electrical methods
More informationFundamentals of DC Testing
Fundamentals of DC Testing Aether Lee erigy Japan Abstract n the beginning of this lecture, Ohm s la, hich is the most important electric la regarding DC testing, ill be revieed. Then, in the second section,
More informationElectric Circuits. June 12, 2013
Electric Circuits June 12, 2013 Definitions Coulomb is the SI unit for an electric charge. The symbol is "C". Electric Current ( I ) is the flow of electrons per unit time. It is measured in coulombs per
More informationPhysics 212. Lecture 9. Electric Current
Physics 212 Lecture 9 Electric Current Exam Here, Tuesday, June 26, 8 9:30 AM Will begin at 7:30 for those who must leave by 9. Office hours 1-7 PM, Rm 232 Loomis Bring your ID! Physics 212 Lecture 9,
More informationCharge The most basic quantity in an electric circuit is the electric charge. Charge is an electrical property of the atomic particles of which matter
Basic Concepts of DC Circuits Introduction An electric circuit is an interconnection of electrical elements. Systems of Units 1 Charge The most basic quantity in an electric circuit is the electric charge.
More information2. The following diagram illustrates that voltage represents what physical dimension?
BioE 1310 - Exam 1 2/20/2018 Answer Sheet - Correct answer is A for all questions 1. A particular voltage divider with 10 V across it consists of two resistors in series. One resistor is 7 KΩ and the other
More informationSIMPLE D.C. CIRCUITS AND MEASUREMENTS Background
SIMPLE D.C. CICUITS AND MEASUEMENTSBackground This unit will discuss simple D.C. (direct current current in only one direction) circuits: The elements in them, the simple arrangements of these elements,
More informationChapter 19 Lecture Notes
Chapter 19 Lecture Notes Physics 2424 - Strauss Formulas: R S = R 1 + R 2 +... C P = C 1 + C 2 +... 1/R P = 1/R 1 + 1/R 2 +... 1/C S = 1/C 1 + 1/C 2 +... q = q 0 [1-e -t/(rc) ] q = q 0 e -t/(rc τ = RC
More information= e = e 3 = = 4.98%
PHYS 212 Exam 2 - Practice Test - Solutions 1E In order to use the equation for discharging, we should consider the amount of charge remaining after three time constants, which would have to be q(t)/q0.
More informationGY 402: Sedimentary Petrology
UNIVERSITY OF SOUTH ALABAMA GY 402: Sedimentary Petrology Lecture 27: Introduction to Wireline Log Interpretations Instructor: Dr. Douglas W. Haywick Last Time Carbonate Diagenesis Diagenesis 0.5 mm PPL
More information7/06 Electric Fields and Energy
Part ASome standard electric field and potential configurations About this lab: Electric fields are created by electric charges and exert force on charges. Electric potential gives an alternative description.
More informationPhysics 420 Fall 2004 Quiz 1 Wednesday This quiz is worth 6 points. Be sure to show your work and label your final answers.
Quiz 1 Wednesday This quiz is worth 6 points. Be sure to show your work and label your final answers. 1. A charge q 1 = +5.0 nc is located on the y-axis, 15 µm above the origin, while another charge q
More informationLecture 14 Current Density Ohm s Law in Differential Form
Lecture 14 Current Density Ohm s Law in Differential Form Sections: 5.1, 5.2, 5.3 Homework: See homework file Direct Electric Current Review DC is the flow of charge under electrostatic forces in conductors
More informationAnalysis of electrical resistivity data for the determination of aquifer depth at Sapele RD in Benin city
Available online at www.pelagiaresearchlibrary.com Advances in Applied Science Research, 203, 4(6):268-276 ISSN: 0976-860 CODEN (USA): AASRFC Analysis of electrical resistivity data for the determination
More informationGeophysics for Environmental and Geotechnical Applications
Geophysics for Environmental and Geotechnical Applications Dr. Katherine Grote University of Wisconsin Eau Claire Why Use Geophysics? Improve the quality of site characterization (higher resolution and
More informationMATH 312 Section 3.1: Linear Models
MATH 312 Section 3.1: Linear Models Prof. Jonathan Duncan Walla Walla College Spring Quarter, 2007 Outline 1 Population Growth 2 Newton s Law of Cooling 3 Kepler s Law Second Law of Planetary Motion 4
More informationChapter 30. Inductance
Chapter 30 Inductance Self Inductance When a time dependent current passes through a coil, a changing magnetic flux is produced inside the coil and this in turn induces an emf in that same coil. This induced
More informationElectrical Eng. fundamental Lecture 1
Electrical Eng. fundamental Lecture 1 Contact details: h-elhelw@staffs.ac.uk Introduction Electrical systems pervade our lives; they are found in home, school, workplaces, factories,
More informationDC circuits, Kirchhoff s Laws
DC circuits, Kirchhoff s Laws Alternating Current (AC), Direct Current (DC) DC Circuits Resistors Kirchhoff s Laws CHM6158C - Lecture 2 1 Electric current Movement of electrons in a conductor Examples
More information09-Circuit Theorems Text: , 4.8. ECEGR 210 Electric Circuits I
09Circuit Theorems Text: 4.1 4.3, 4.8 ECEGR 210 Electric Circuits I Overview Introduction Linearity Superposition Maximum Power Transfer Dr. Louie 2 Introduction Nodal and mesh analysis can be tedious
More informationCHARACTERIZATION OF SOIL PROFILE OF DHAKA CITY USING ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT)
CHARACTERIZATION OF SOIL PROFILE OF DHAKA CITY USING ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT) Mehedi Ahmed ANSARY 1, B.S. Pushpendue BISWAS 2 and Abul KHAIR 3 1 Professor, Department of Civil Engineering
More informationThe objective of a grounding system are: 1. To provide safety to personnel during normal and fault conditions by limiting step and touch potential.
GROUNDING SYSTEMS Part 1 Professor Ahdab Elmorshedy 1 Reference: High Voltage Engineering Theory and Practice, Text Book, Marcel Dekker Inc. NY, USA, 2000. Mazen Abdel-Salam, Hussein Anis, Ahdab Elmorshedy,
More information6. In a dry cell electrical energy is obtained due to the conversion of:
1. If a wire of uniform area of cross section is cut into two halves (equal in size), the resistivity of each part will be: a) Halved. b) Doubled. c) Becomes four times its initial value. d) Remains the
More informationPhysics 102: Lecture 05 Circuits and Ohm s Law
Physics 102: Lecture 05 Circuits and Ohm s Law Physics 102: Lecture 5, Slide 1 Summary of Last Time Capacitors Physical C = ke 0 A/d C=Q/V Series 1/C eq = 1/C 1 + 1/C 2 Parallel C eq = C 1 + C 2 Energy
More informationENGR 2405 Class No Electric Circuits I
ENGR 2405 Class No. 48056 Electric Circuits I Dr. R. Williams Ph.D. rube.williams@hccs.edu Electric Circuit An electric circuit is an interconnec9on of electrical elements Charge Charge is an electrical
More informationELECTRICITY AND MAGNETISM
ELECTRICITY AND MAGNETISM Chapter 1. Electric Fields 1.1 Introduction 1.2 Triboelectric Effect 1.3 Experiments with Pith Balls 1.4 Experiments with a Gold-leaf Electroscope 1.5 Coulomb s Law 1.6 Electric
More informationElectrical Circuits (2)
Electrical Circuits (2) Lecture 7 Transient Analysis Dr.Eng. Basem ElHalawany Extra Reference for this Lecture Chapter 16 Schaum's Outline Of Theory And Problems Of Electric Circuits https://archive.org/details/theoryandproblemsofelectriccircuits
More informationElectricity and Light Pre Lab Questions
Electricity and Light Pre Lab Questions The pre lab questions can be answered by reading the theory and procedure for the related lab. You are strongly encouraged to answers these questions on your own.
More informationProblem info Geometry model Labelled Objects Results Nonlinear dependencies
Problem info Problem type: Transient Magnetics (integration time: 9.99999993922529E-09 s.) Geometry model class: Plane-Parallel Problem database file names: Problem: circuit.pbm Geometry: Circuit.mod Material
More informationCapacitors. Charging a Capacitor. Charge and Capacitance. L05: Capacitors and Inductors
L05: Capacitors and Inductors 50 Capacitors 51 Outline of the lecture: Capacitors and capacitance. Energy storage. Capacitance formula. Types of capacitors. Inductors and inductance. Inductance formula.
More informationMEP 382: Design of Applied Measurement Systems Lecture 3: DC & AC Circuit Analysis
Faculty of Engineering MEP 38: Design of Applied Measurement Systems Lecture 3: DC & AC Circuit Analysis Outline oltage and Current Ohm s Law Kirchoff s laws esistors Series and Parallel oltage Dividers
More informationExercise 1: RC Time Constants
Exercise 1: RC EXERCISE OBJECTIVE When you have completed this exercise, you will be able to determine the time constant of an RC circuit by using calculated and measured values. You will verify your results
More information2.004 Dynamics and Control II Spring 2008
MIT OpenCourseWare http://ocwmitedu 00 Dynamics and Control II Spring 00 For information about citing these materials or our Terms of Use, visit: http://ocwmitedu/terms Massachusetts Institute of Technology
More informationElectricity. Revision Notes. R.D.Pilkington
Electricity Revision Notes R.D.Pilkington DIRECT CURRENTS Introduction Current: Rate of charge flow, I = dq/dt Units: amps Potential and potential difference: work done to move unit +ve charge from point
More informationSPS Mathematical Methods Lecture #7 - Applications of First-order Differential Equations
1. Linear Models SPS 2281 - Mathematical Methods Lecture #7 - Applications of First-order Differential Equations (a) Growth and Decay (b) Half-life of Radioactive (c) Carbon Dating (d) Newton s Law of
More informationLecture 18 Capacitance and Conductance
Lecture 18 Capacitance and Conductance Sections: 6.3, 6.4, 6.5 Homework: See homework file Definition of Capacitance capacitance is a measure of the ability of the physical structure to accumulate electrical
More informationExperiment Aim: Students will describe the magnitude of resistance and define the EMF (electromotive force) of a cell.
Experiment I: Electromotive force and internal resistance Experiment Aim: Students will describe the magnitude of resistance and define the EMF (electromotive force) of a cell. Experimental tools and materials:
More information