This message was made with 100% recycled electrons
|
|
- Jessica Poole
- 6 years ago
- Views:
Transcription
1 What is the foundation of most modern technologies: phones, computers etc? This message was made with 100% recycled electrons Day 3: Questions? Finish circuit review Begin Copiers: Bloomfield 10.2 Photoconductors (Blm 12.1). Reminders/Updates: HW anyone start? Lab Starts this week! All info is on web (I think) 1
2 Reading Quiz: SILENT!!!! (45 seconds / question) 1. If I know the amount of voltage across a flashlight battery, I can always calculate the amount of electrical power the flashlight is consuming, no matter what else I know or do not know about the circuit. a. true b. false 2. If you could not measure the resistance, which property would be most useful to know in guessing whether an unknown material was a conductor or an insulator? 3. A photoconductor is: 2
3 1. Compare the brightness of identical bulbs, bulb 1 compared to bulb 2? a. brighter, b. dimmer, c. same 1.5 V + 1 2
4 2. How will brightness of bulb 1 in left circuit compare to brightness of the same bulb in the right circuit (no #2)? a. brighter, b. dimmer, c. same 1.5 V V
5 case 1 3. All bulbs(r) and batteries (V) are identical. How does current flow through circuit in case 1 compare to case 2? a. Current in case 2 is 1/4 of current in case 1 b. Current in case 2 is 1/2 of current in case 1 c. Current in case 2 is same as current in case 1 d. Current in case 2 is 2 times current in case 1 e. Current in case 2 is 4 times current in case 1 case 2 + Bulb 2 Bulb 3
6 4. When close switch battery life a. same as when open b. longer than when open c. much shorter
7 Photocopiers learning goals (see web, abbreviated here) 1. explain how you could write on paper with photoconductor, toner, light, high voltage wire. (basic design of copier) 2. Be able to explain why materials are conductors, insulators, or semiconductors in terms of energy levels and electron motion. 3. Explain how heat or light changes resistance of semiconductor. Big picture: 1. Coulomb attraction of positively charged ink particles (toner) to negatively charged surface. 2. Negative charges on surface distributed to match image to be copied. 3. Control charge distribution by shining light on surface, where light hits, negative charges leave, so no ink will stick. The big challenge how to get charges to leave when light shines on surface? 7
8 Photocopiers A brief history Chester Carlson says: there must be a way to copy things! Recopying and photography too expensive and timeconsuming. Others existed ditto, etc Chester Carlson produces first xerographic image in his lab in Astoria, Queens ASTORIA. Materials: Sulfer, handkerchief, bright light, spoors from a club moss: lycopodium powder Wax paper and heat Turned down by 20 companies 1959 Launches the Xerox 914, the first automatic, plainpaper office copierwhich becomes the topselling industrial product of all time
9 Photocopying step 1: Copper Electron comb Overhead Transparencies (insulator) When I drag the copper comb across the transparencies: a. Negative charges flow through the transparencies and into the floor, b. Nothing. c. Negative charges will build up on the transparencies just in the areas where the comb touches d. Negative charges will be everywhere on the transparencies, even the parts I don t touch with the comb. 9
10 Photocopying step 2: What will happen if I draw on the plate with my finger? a. Nothing will happen b. The entire plate will lose it s negative charge. c. Only the areas of the plate that I touch will lose their negative charge. 10
11 Photocopying step 3: Toner sticking to charged surface What will happen if I draw on the plate with my finger? Chalk only sticks to places with negative charge because the chalk is a. positively charged, b. negatively charged, c. uncharged (neutral), d. both a and c are correct e. both b and c are correct. 11
12 Chalk only sticks to places with negative charge because the chalk is: Why? If positively charged, opposites attract. If neutral, can be polarized with negatives on chalk getting pushed to far side of dust particle, so attraction of positives is bigger than repulsion of negatives. Just like charged balloon and neutral wall. Either or (see sweater simulation) 12
13 Photoconductor Making a Copy Part I: a charge image Corona wire metal velocity Light Document Light Charge image
14 Part II: Transferring Charge Image to Toner and Paper Just like Part I, in reverse Charge image toner Positive toner particle Roller and brush Black image Release toner Light Charge Paper Heat 14
15 All Pretty Simple ChargePhysics (opposites attract), except Document Charge image
16 Photoconductorsway to get charges to leak away when shine light on surface. (side view) 1. before light. e s want to go to bottom, but R too high, stuck conducting plate V 2. where light hits, R low, electrons flow away. V 16
17 Semiconductor physics where light hits, R low, electrons flow away, then add ink, sticks only where charges. Very special material low R ( conducts ) only when light hits. Photoconductor V To understand, have to understand what determines resistance of a material. insulators (wood, ceramic, plastic) very high resistance. conductors (metals) very low resistance semiconductors in the middle. Resistance depends on temp., light, cleanliness. 17
18 Resistance Conductors (low resistance) metals Insulators (high R) plastic, glass, stuff in between (semiconductors) measure stuff with ohmmeter examples. If moving charge determines conductors, insulators, etc, it must be something about electrons and their relations to atoms that matters. Resistance: 1) Amount of stuff to bump into (copper vs impure copper vs tungsten) 2) Number of electrons free to move. (biggest effect) 18
19 Energy Levels: # of electrons that can move depends on energy levels in material. Explain (different and better(?) than book) Only two electrons (1 spin up and 1 spin down) per energy level. (Simplify to 1 per level and always a spin up and a spin down sublevel for each level.) empty energy levels Energy filled energy levels 19
20 but if jam a whole bunch of atoms together in a solid, energy levels get combined/smeared out. Energy levels get shifted and shared for all atoms and electrons. 20
21 In solid, `10 22 atoms/cm 3, many!! electrons, and levels countless levels smeared together, individual levels indistinguishable. "bands" of levels. Each level filled with 2 electrons until run out. Energy atom level more atoms empty conduction empty band band gap ~ few ev filled with electrons filled with electrons bands valence band 21
22 In book top is conduction band. lower is valence band, How many energy levels are in conduction band? a. none, b. 1 c. between 1 and 10, d. an enormous number How many electrons are in valence band? a. none, b. 1 c. between 1 and 10, d. an enormous number 22
23 Microscopic look at material conductor empty levels very close empty full electron like ball rolling on almost flat ground insulator big jump to empties. empty gap no levels full electron like ball in pit. move easily Can t move without big boost. semiconductor half way in between. empty Little gap to empty levels full like shallow pit. 23
24 If apply voltage to make electron move, it must go into a. higher energy level, b. lower energy level, c. does not matter, these are the energy levels of electrons in atoms, no connection with motion moving a. higher moving, more energy, really only slightly higher level. stationary If push on electrons (apply voltage to material) which ones will move? a. all of them in bands 1,2,3 b. none of them c. all of them in band 3 d. only the top one in band three d. only the top one in band 3. The others have no higher level they can move into, all filled with other electrons. After top one has gotten pushed up room to move next one below it. so maybe include billion or so really close ones. 24
25 E empty full The seating analogy How about these e s? full Easy to push to right? position (x) RULE: for electrons to move (with a voltage applied) There must be an empty energy level immediately above where they are 25
26 PhET conductivity sim on phet site (also semiconductor and diode sim there) 26
Electromagnetism Review Sheet
Electromagnetism Review Sheet Electricity Atomic basics: Particle name Charge location protons electrons neutrons + in the nucleus - outside of the nucleus neutral in the nucleus What would happen if two
More informationSemiconductors & LEDs
Semiconductors & LEDs Day 37, Phys 2130 Questions? Semiconductors &LEDs Next up: EPR, Entanglement, Bell, Bound State Sim.. Many Wells 2 1 In solid, `10 22 atoms/cm 3, many!! electrons, and levels countless
More informationLast time. Physics 202. Conductors vs insulators. Charging by induction. The stuff we call matter is held together by the force of electricity.
Last time Physics 202 The stuff we call matter is held together by the force of electricity. We are simply bags of static electricity. We stand on atoms held together by electricity. Everything (OK, baryonic
More informationUniversity of Maryland Department of Physics
Spring 3 University of Maryland Department of Physics Laura Lising Physics 1 March 6, 3 Exam #1 nswer all questions on these sheets. Please write clearly and neatly: We can only give you credit for what
More informationELECTRICITY Electric Fence Experiment.
ELECTRICITY Electric Fence Experiment. Can you guess what will happen? What would life be like without electricity? List 4 things that you would miss the most: 1) 2) 3) 4) Positive and Negative Charge
More informationProtons = Charge Electrons = Charge Neutrons = Charge. When Protons = Electrons, atoms are said to be ELECTRICALLY NEUTRAL (no net charge)
QUICK WRITE: For 2 minutes, write the three parts of an atom and what their charges are. Explain what creates an electric charge (positive or negative) on something. Rules - You MUST write for the entire
More informationName: Class: Date: 1. Friction can result in the transfer of protons from one object to another as the objects rub against each other.
Class: Date: Physics Test Review Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. 1. Friction can result in
More informationConcepTest PowerPoints
ConcepTest PowerPoints Chapter 16 Physics: Principles with Applications, 7 th edition Giancoli 2014 Pearson Education, Inc. This work is protected by United States copyright laws and is provided solely
More informationYr. 9 Electricity WorkBook
Yr. 9 Electricity WorkBook On completion of this booklet students should be able to: Recall the structure of a neutral atom: three particles, their charges, their location; Nucleus (Proton positive, Neutron-
More informationWhat is dynamic electricity?
Dynamic Electricity What is dynamic electricity? Has to do with charges in motion So we re talking about moving electrons Think about any electronic device Dynamic electricity Think back to properties
More informationElectricity MR. BANKS 8 TH GRADE SCIENCE
Electricity MR. BANKS 8 TH GRADE SCIENCE Electric charges Atoms and molecules can have electrical charges. These are caused by electrons and protons. Electrons are negatively charged. Protons are positively
More informationElectrostatics is the study of non-moving electric charges, sometimes called static electricity.
Electrostatic Phenomena Electrostatics is the study of non-moving electric charges, sometimes called static electricity. A simple experiment will demonstrate the phenomena. 1. Take a polythene rod and
More information- Memorize the terms voltage, current, resistance, and power. - Know the equations Ohm s Law and the Electric Power formula
E: Know Circuit Vocabulary (Short Answer) Level 2 Prerequisites: Know Circuit Vocabulary (Short Answer); Recognize Insulators and Conductors Objectives: - Memorize the terms voltage, current, resistance,
More informationAn Introduction to Electricity and Circuits
An Introduction to Electricity and Circuits Materials prepared by Daniel Duke 4 th Sept 2013. This document may be copied and edited freely with attribution. This course has been designed to introduce
More informationName: Block: Date: NNHS Introductory Physics: MCAS Review Packet #4 Introductory Physics, High School Learning Standards for a Full First-Year Course
Introductory Physics, High School Learning Standards for a Full First-Year Course I. C ONTENT S TANDARDS electricity and magnetism. 5.1 Recognize that an electric charge tends to be static on insulators
More informationStudent Instruction Sheet: Unit 3 Lesson 1. Static and Current Electricity
Student Instruction Sheet: Unit 3 Lesson 1 Suggested Time: 1.2 Hours What s important in this lesson: Static and Current Electricity explain common electrostatic phenomena (e.g., clothes that stick together,
More informationPhysics 9 Monday, April 7, 2014
Physics 9 Monday, April 7, 2014 Handing out HW11 today, due Friday. Finishes induced emf; starts circuits. For today: concepts half of Ch31 (electric circuits); read equations half for Wednesday. Annotated
More informationElectricity. What is electricity?
Words attract = pull towards an object back and forth = to go in one direction and then in the other balanced = the same as stable carbon = a chemical material that is in coal or petrol. It is in its purest
More informationBell Ringer: Define to the best of your ability the definition of:
Bell Ringer: Define to the best of your ability the definition of: Potential Energy Electric Potential Energy Electric Circuit Current Voltage Resistance Coulomb Notes 7.1: Electrostatic Force This lesson
More informationElectric Force and Charges. Conceptual Physics 11 th Edition. Electric Force and Charges
Conceptual Physics 11 th Edition Central rule of electricity Opposite charges attract one another; like charges repel. Chapter 22: ELECTROSTATICS This lecture will help you understand: Electrical Forces
More informationExercises Electrical Forces and Charges (pages )
Exercises 321 Electrical Forces and Charges (pages 645 646) 1 Circle the letter beside the correct comparison of the strengths of the gravitational force and the electrical force a The gravitational force
More informationElectricity. Prepared by Juan Blázquez, Alissa Gildemann. Electric charge is a property of all objects. It is responsible for electrical phenomena.
Unit 11 Electricity 1. Electric charge Electric charge is a property of all objects. It is responsible for electrical phenomena. Electrical phenomena are caused by the forces of attraction and repulsion.
More informationPhysics Worksheet Electrostatics, Electric Fields and Potential Section: Name: Electric Charges
Electric Charges 1. The fundamental rule of all electrical phenomena is: Like charges, opposite charges 2. Thomson s cathode ray experiment proved that: _ 3. Millikan s oil drop experiment proved that:
More informationQuest Chapter 32. Think Is this any different than the electrons flying around a nucleus?
1 How does the mass of an object change when it acquires a positive charge? 1. Increases 2. More information is needed. 3. Decreases 4. Doesn t change 2 Why do clothes often cling together after tumbling
More informationRevision Sheet grade 4
Revision Sheet grade 4 Materials for the final exam grade 4 : 1- Science book (pages 484 to 528). 2- The final revision sheet and the copy book. 3- The science booklet. Prepared by: Miss Tamara Al. Majali
More informationEssential Questions: How does electricity work, and why does it form? How can electricity be useful?
Essential Questions: How does electricity work, and why does it form? How can electricity be useful? Appliances Lamps Computers Refrigerators Microwaves Flashlights Cell phones Video games All matter is
More informationP.Ravindran, PHY041: Electricity & Magnetism 08 January 2013: Electrostatics
Electrostatics 1 Electrostatics: Coulomb s Law The MAN: Charles Augustin de Coulomb He was born in 1736 in Angoulême, France. He received the majority of his higher education at the Ecole du Genie at Mezieres
More informationSection 1 Electric Charge and Force
CHAPTER OUTLINE Section 1 Electric Charge and Force Key Idea questions > What are the different kinds of electric charge? > How do materials become charged when rubbed together? > What force is responsible
More informationElectricity and Electromagnetism SOL review Scan for a brief video. A. Law of electric charges.
A. Law of electric charges. Electricity and Electromagnetism SOL review Scan for a brief video The law of electric charges states that like charges repel and opposite charges attract. Because protons and
More informationELECTRON THEORY
ELECTRON THEORY We will start our discussion of electron theory with a few definitions. Matter- is anything that has mass and takes up space. The basic unit of matter is the atom. Another Definition Energy-
More information9. Which of the following is the correct relationship among power, current, and voltage?. a. P = I/V c. P = I x V b. V = P x I d.
Name: Electricity and Magnetism Test Multiple Choice Identify the choice that best completes the statement. 1. Resistance is measured in a unit called the. a. ohm c. ampere b. coulomb d. volt 2. The statement
More information7.9.4 Static Electricity
7.9.4 Static Electricity 71 minutes 79 marks Page 1 of 19 Q1. The diagram shows a student after rubbing a balloon on his hair. The balloon and hair have become charged. (a) Draw a ring around the correct
More informationSNC1D7 Current Electricity
SNC1D7 Current Electricity Static electricity review... Static electricity is electrons gathered in one place (surface of object) and randomly move in all direction What do we use electricity for? hmm
More informationf Static Electricity:
ELECTRICITV VOCflB WORDS Electricity: f Static Electricity: Current Electricity: Electron: Neutron: Proton: Attraction: Repulsion: / ^ Source: Conductor: Insulator: Load: Switch: Series Circuit: Parallel
More informationUniversity of Maryland Department of Physics
Spring 2002 University of Maryland Department of Physics Laura Lising Physics 122 April 24, 2003 Exam #2 Solutions Multiple choice questions. Just the answer counts for these. (8 points each) 1) Suppose
More informationElectric Charges & Current. Chapter 12. Types of electric charge
Electric Charges & Current Chapter 12 Types of electric charge Protons w/ + charge stuck in the nucleus Electrons w/ - charge freely moving around the nucleus in orbits 1 Conductors Allow the easy flow
More informationWhat does it mean for an object to be charged? What are charges? What is an atom?
What does it mean for an object to be charged? What are charges? What is an atom? What are the components of an atom? Define the following: Electric Conductor Electric Insulator Define the following: Electric
More informationEssential Questions: How does electricity work, and why does it form? How can electricity be useful?
Essential Questions: How does electricity work, and why does it form? How can electricity be useful? Appliances Lamps Computers Refrigerators Microwaves Flashlights Cell phones Video games All matter is
More informationPhysics 1520, Fall 2011 Quiz 3, Form: A
Physics 1520, Fall 2011 Quiz 3, Form: A Name: Date: Numeric answers must include units. Sketches must be labeled. All short-answer questions must include your reasoning, for full credit. A correct answer
More informationNow let s look at some devices that don t have a constant resistance.
Lab #3 Now let s look at some devices that don t have a constant resistance. This is the same circuit you built last time. But now, in place of the resistor first build the circuit with a light bulb, then
More informationELECTRICITY. This chain is similar to the fire fighter's bucket brigades in olden times. But
ELECTRICITY Electricity figures everywhere in our lives. Electricity lights up our homes, cooks our food, powers our computers, television sets, and other electronic devices. Electricity from batteries
More informationIn this unit, we will examine the movement of electrons, which we call CURRENT ELECTRICITY.
Recall: Chemistry and the Atom! What are the 3 subatomic Where are they found in the particles? atom? What electric charges do they have? How was a positive ion created? How was a negative ion created?
More informationA negatively charged object has more electrons than protons. A negatively charged object has more electrons than protons
Electricity Electricity Describes all phenomena caused by positive and negative charges Electrical charge is caused by protons and electrons Electrons and protons are subatomic particles found in the atom
More informationEL FORCE and EL FIELD HW-PRACTICE 2016
1 EL FORCE and EL FIELD HW-PRACTICE 2016 1.A difference between electrical forces and gravitational forces is that electrical forces include a. separation distance. b. repulsive interactions. c. the inverse
More informationElectricity and Why it Moves
Electricity and Why it Moves Unit 9: 1 Electricity Electrons can move, but protons are held together in the nucleus by the strong nuclear force, the strongest force in nature. Electricity is moving electrons;
More informationName: SNC1 Date: Investigation Electrostatic Series
ACTIVITY #1 Purpose: To determine how charged objects respond to one another and what kind of charge is transferred when a charged object contacts an uncharged one. Pre Lab Questions 1. When acetate and
More informationElectricity. Part 1: Static Electricity
Electricity Part 1: Static Electricity Introduction: Atoms Atoms are made up of charged particles. Atoms are made of 3 subatomic particles: Electrons protons, electrons and neutrons. Protons () Charge
More information7.2. Electric Force 7-2A. What Is the Attraction to Water? Words to Know. Find Out ACTIVITY. Materials. What Did You Find Out?
7.2 Electric Force Electric force acts on objects even if they are not touching. Objects with the same charge repel each other. Objects with opposite charges attract each other. Neutral objects are attracted
More informationSome differences: Some basic similarities: Charges. Electrons vs. Protons 4/3/15. Chapters 22-25: Electromagnetism!
Chapters 22-25: Electromagnetism! Electric Force vs. Gravitational Force What properties does the gravitational force depend on? What properties does the electric force depend on? F grav = Gm 1 m 2 /d
More informationhttps://www.youtube.com/watch?v=yc2-363miqs
https://www.youtube.com/watch?v=yc2-363miqs SCIENCE 9 UNIT 3 ELECTRICITY Remember: In the last unit we learned that all matter is made up of atoms atoms have subatomic particles called, protons, neutrons
More informationElectric charge. Book page Syllabus Lightening 16/3/2016
Electric charge Book page 66 69 Syllabus 2.19 2.23 16/3/2016 Lightening cgrahamphysics.com 2016 Test your knowledge Where is the lightning capital of the world? What should you do when you hear thunder?
More informationUnit 3 BLM Answers UNIT 3 BLM 3-46
UNIT 3 BLM 3-46 Unit 3 BLM Answers BLM 3-3, Charge Transfer Diagrams 1. Positively charged objects should have more (+) than ( ). Negatively charged objects should have more ( ) than (+). 2. They must
More information1. Voltage is how much work is being done for a charge. 2. Lightning is the electric breakdown of air by weak electric fields and is a flow of energy.
Chapters 17 and 18 Practice Problems True or False 1. Voltage is how much work is being done for a charge. 2. Lightning is the electric breakdown of air by weak electric fields and is a flow of energy.
More informationDetecting the Electric Field
Detecting the Electric Field Overview: You are actually fairly familiar with electric fields, too, but you may not know it. Have you ever rubbed your feet against the floor and then shocked your brother
More informationELECTROSTATICS. the study of electric charges, forces and fields Static Electricity is Stationary Electricity or Accumulation of charge
Electrostatics 1 ELECTROSTATICS the study of electric charges, forces and fields Static Electricity is Stationary Electricity or Accumulation of charge Fundamental Rule Opposites attract, Likes Repel Things
More informationToday: Examples of Tunneling
Today: Examples of Tunneling 1. Last time: Scanning tunneling microscope. 2. Next: Alpha particle tunneling HWK13 Postponed until next week. STM (picture with reversed voltage, works exactly the same)
More information1) The charge of an electron is. A) negative. B) positive. C) Electrons have no charge.
1) The charge of an electron is A) negative. B) positive. C) Electrons have no charge. 2) Two like charges A) have no effect on each other. B) repel each other. C) must be neutrons. D) neutralize each
More informationDissectable Leyden Jar P6-3380
WWW.ARBORSCI.COM Dissectable Leyden Jar P6-3380 BACKGROUND: This apparatus is designed to demonstrate the principles of static electricity, the use of a Leyden jar, and to allow the student to investigate
More informationWhat can laser light do for (or to) me?
What can laser light do for (or to) me? Phys 1020, Day 15: Questions? Refection, refraction LASERS: 14.3 Next Up: Finish lasers Cameras and optics 1 Eyes to web: Final Project Info Light travels more slowly
More informationMagnets attract some metals but not others
Electricity and Magnetism Junior Science Magnets attract some metals but not others Some objects attract iron and steel. They are called magnets. Magnetic materials have the ability to attract some materials
More informationElectricity Review completed.notebook. June 13, 2013
Which particle in an atom has no electric charge associated with it? a. proton c. neutron b. electron d. nucleus Jun 12 9:28 PM The electrons in a metal sphere can be made to move by touching it with a
More information3rd Grade Motion and Stability
Slide 1 / 106 Slide 2 / 106 3rd Grade Motion and Stability 2015-11-09 www.njctl.org Slide 3 / 106 Table of Contents Forces and Motion Review Balanced and Unbalanced Forces Motion prediction from patterns
More informationc. They have electric charges that move freely d. Electrons are added to the rod a. charges are of unlike signs b. charges are of like signs
Physics Review Chapter 17 & 18 Name: Date: Period: 1. What sentence best characterizes electron conductors? a. They have low mass density b. They have high tensile strength c. They have electric charges
More informationProperties of Electric Charge
1 Goals 2 Properties of Electric Charge 2 Atomic Structure: Composed of three main particles: 1. Proton 2. Neutron 3. Electron Things to Remember: 3 Everything is made of atoms. Electrons can move from
More information1. A1, B3 2. A1, B2 3. A3, B2 4. A2, B2 5. A3, B3 6. A1, B1 7. A2, B1 8. A2, B3 9. A3, B1
peden (jp5559) Time onstants peden (0100) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Test is Thursday!
More informationStatic Electricity. Electric Field. the net accumulation of electric charges on an object
Static Electricity the net accumulation of electric charges on an object Electric Field force exerted by an e - on anything that has an electric charge opposite charges attract like charges repel Static
More informationCurrent. I = ei e = en e Av d. The current, which is Coulomb s per second, is simply
Current The current, which is Coulomb s per second, is simply I = ei e = en e Av d e is the charge is the electron! ne is the density of electrons! A is the cross sectional area of the wire! vd is the
More informationSection 1: Electric Charge and Force
Electricity Section 1 Section 1: Electric Charge and Force Preview Key Ideas Bellringer Electric Charge Transfer of Electric Charge Induced Charges Charging by Contact Electric Force Electric Field Lines
More informationChapter 1. Electrostatics. The Electric Charge
Chapter 1 Electrostatics The Electric Charge Electric charge, or electricity, can come from batteries and generators. But some materials become charged when they are rubbed. Their charge is sometimes called
More informationUniversity of Maryland Department of Physics. Spring 2009 Final Exam 20. May (175 points) Post grades on web? (Initial, please) Yes No
University of Maryland Department of Physics Physics 122 20. May 2009 (175 points) Post grades on web? (Initial, please) Yes No (If you agree, I will post your grades and your detailed scores for each
More informationPhysics Test Review Electrostatics, Electric Fields and Potential Session: Name:
Physics Test Review lectrostatics, lectric Fields and Potential Session: Name: Multiple hoice Identify the letter of the choice that best completes the statement or answers the question. 1. Two unlike
More informationA Deeper Look at Electricity A First Look at Magnets. NBSP Physical Science Institute Tuesday July 23, 2002
A Deeper Look at Electricity A First Look at Magnets NBSP Physical Science Institute Tuesday July 23, 2002 1 Currents: Thinking Deeper Our model for current so far: The current in a circuit depends on
More informationPhysics 2020 Lab 5 Intro to Circuits
Physics 2020 Lab 5 Intro to Circuits Name Section Tues Wed Thu 8am 10am 12pm 2pm 4pm Introduction In this lab, we will be using The Circuit Construction Kit (CCK). CCK is a computer simulation that allows
More informationLab 3: Electric Charge and Force
Lab 3: Electric Charge and Force Name: Group Members: Date: TA s Name: Objectives: To become familiar with basic electric phenomena. To learn the charge model and apply it to conductors and insulators.
More informationLESSON 5: ELECTRICITY II
LESSON 5: ELECTRICITY II The first two points are a review of the previous lesson 1.1.ELECTRIC CHARGE - Electric charge is a property of all objects and is responsible for electrical phenomena. -All matter
More informationPower lines. Why do birds sitting on a high-voltage power line survive?
Power lines At large distances, the resistance of power lines becomes significant. To transmit maximum power, is it better to transmit high V, low I or high I, low V? (a) high V, low I (b) low V, high
More informationConceptual Questions. Fig.8.51 EXERCISES. 8. Why can t electric field lines cross? 9. In which direction do charges always move in an electric field?
EXERCISES Conceptual Questions 1. Explain why a neutral object can be attracted to a charged object. Why can this neutral object not be repelled by a charged object? 2. What is the function of an electroscope?
More informationMaterials can become electrically charged.
Page of 8 KY CONCPT Materials can become electrically charged. BFOR, you learned Atoms are made up of particles called protons, neutrons, and electrons Protons and electrons are electrically charged NOW,
More information2. In words, what is electrical current? 3. Try measuring the current at various points of the circuit using an ammeter.
PS 12b Lab 1a Fun with Circuits Lab 1a Learning Goal: familiarize students with the concepts of current, voltage, and their measurement. Warm Up: A.) Given a light bulb, a battery, and single copper wire,
More information3rd Grade. Forces and Motion Review. Slide 1 / 106 Slide 2 / 106. Slide 4 / 106. Slide 3 / 106. Slide 5 / 106. Slide 6 / 106. Motion and Stability
Slide 1 / 106 Slide 2 / 106 3rd Grade Motion and Stability 2015-11-09 www.njctl.org Slide 3 / 106 Slide 4 / 106 Table of Contents Forces and Motion Review Balanced and Unbalanced Forces Motion prediction
More informationHistory. The word electricity comes from the Greek elektron which means amber. The amber effect is what we call static electricity.
Electrostatics 1 History The word electricity comes from the Greek elektron which means amber. The amber effect is what we call static electricity. 2 ELECTROSTATICS the study of electric charges, forces
More informationSymbol Meaning unit. 2. k 3. q. 4. r. 5. E 6. R Total 7. 1/R Total 8. P 9. V 10. I 11. R. 12. Q 13. N 14. e 15. F magnetic 16. v 17.
Name period 3 rd 9 weeks test PEOPLE and SYMBOLS practice Instructions: Work in groups following Quiz-Quiz-Trade activity Date: Monday 2/25/13 Write what each symbol means, including the unit Symbol Meaning
More informationCIRCUITS: Series & Parallel
CIRCUITS: Series & Parallel Last Week s BIG IDEAS: Opposite charged objects attract Like charged objects repel Last Week s BIG IDEAS: The electrons are the loose particles that move to make things charged
More informationConcepTest Clicker Questions. Chapter 26 Physics: for Scientists & Engineers with Modern Physics, 4th edition Giancoli
ConcepTest Clicker Questions Chapter 26 Physics: for Scientists & Engineers with Modern Physics, 4th edition Giancoli 2008 Pearson Education, Inc. This work is protected by United States copyright laws
More informationPhysics 312 Assignment 5
Physics 31 Assignment 5 This assignment contains many short questions and a long one. Several questions are taken from Bloom eld Section 11., with some changes. 1. ( points) It is possible to combine the
More informationResistance Learning Outcomes
Resistance Learning Outcomes Define resistance and give its unit. Solve problems about resistance. State Ohm s Law. HL: Derive the formulas for resistors in series and parallel. Solve problems about resistors
More informationElectric Force and Charge. Electric Force and Charge. Electric Force and Charge. Electric Force and Charge. Electric Force and Charge
Hewitt/Lyons/Suchocki/Yeh Conceptual Integrated Science Chapter 7 ELECTRICITY AND MAGNETISM Electric forces can attract some objects and repel others Electric charge: the fundamental quantity that underlies
More informationElectric Current & DC Circuits
Electric Current & DC Circuits Circuits Click on the topic to go to that section Conductors Resistivity and Resistance Circuit Diagrams Measurement EMF & Terminal Voltage Kirchhoff's Rules Capacitors*
More informationElectric Charge and Force
CHAPTER 17 21 SECTION Electricity Electric Charge and Force KEY IDEAS As you read this section, keep these questions in mind: What are the different kinds of electric charge? How do materials become electrically
More informationElectricity. Chapter 21
Electricity Chapter 21 Electricity Charge of proton Positive Charge of electron Negative Charge of neutron NONE Atoms have no charge because the charges of the protons and electrons cancel each other out.
More informationElectricity & Magnetism
Electricity & Magnetism Unit 7 Recall that Atoms l Have neutrons, protons, and electrons. l Protons are positively charged l Electrons are negatively charged l Opposite charges attract l Same charges repel
More informationElectricity & Magnetism. Unit 6
Electricity & Magnetism Unit 6 Recall that Atoms l Have neutrons, protons, and electrons. l Protons are positively charged l Electrons are negatively charged l Opposite charges attract l Same charges repel
More informationBasic Electricity Video Exam
Name: Class: Date: Basic Electricity Video Exam Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Matter is made of. a. plasma, gas, and solid b. solid,
More informationResistance Learning Outcomes. Resistance Learning Outcomes. Resistance
Resistance Learning Outcomes Define resistance and give its unit. Solve problems about resistance. State Ohm s Law. HL: Derive the formulas for resistors in series and parallel. Solve problems about resistors
More informationCHARGE AND ELECTRIC CURRENT:
ELECTRICITY: CHARGE AND ELECTRIC CURRENT ELECTRIC CHARGE ELECTRIC CURRENT ELECTRIC CIRCUIT DEFINITION AND COMPONENTS EFFECTS OF ELECTRIC CURRENT TYPES OF CIRCUITS ELECTRIC QUANTITIES VOLTAGE CURRENT RESISTANCE
More informationElectricity Questions
Electricity Questions 1. Electricity is always on our mind. T, F, explain. 2. Describe four examples of power outage effects. Forms of Electricity 3. Name the two forms of electricity. 4. What causes static
More informationReview of Static Electricity
Name: Block: Date: IP 614 Review of Static Electricity Central Concept: Stationary and moving charged particles result in the phenomena known as electricity and magnetism. 5.1 Recognize that an electric
More informationNotebook Circuits With Metering. 22 February July 2009
Title: Original: Revision: Authors: Appropriate Level: Abstract: Time Required: NY Standards Met: 22 February 2007 14 July 2009 Notebook Circuits With Metering Jim Overhiser, Monica Plisch, and Julie Nucci
More informationAlgebra Based Physics
Page 1 of 105 Algebra Based Physics Electric Current & DC Circuits 2015-10-06 www.njctl.org Page 2 of 105 Electric Current & DC Circuits Circuits Conductors Resistivity and Resistance Circuit Diagrams
More informationLab 4. Current, Voltage, and the Circuit Construction Kit
Physics 2020, Spring 2009 Lab 4 Page 1 of 8 Your name: Lab section: M Tu Wed Th F TA name: 8 10 12 2 4 Lab 4. Current, Voltage, and the Circuit Construction Kit The Circuit Construction Kit (CCK) is a
More information