PPT-Chapter 17-3 Current and Resistance

Current is the rate of charge movement A current exists whenever there is a net movement o electrical charge through a medium I Current amps A Amount of charge Coulombs C time interval seconds S. Comparing shocks from static electricity and electric currents is like comparing apples and oranges, they are similar but quite different at the same time.. Every year many people are injured and sometimes killed from electrocution as even small amounts of electric current can be lethal. . Lesson 5. Resistance. The amount of current flow in a circuit, and the amount of energy transferred to any useful device, depends on two things; . The potential difference of the power supply. The nature of the pathway through the loads that are using electric potential energy. . and the veterinarian’s role. Outline. Recent news and importance of issue. Antibiotics: information, mode of action. Factors that contribute to resistance. In the free environment. In animals. Resistance: a working definition. Background and concepts. 2. Microhams 2010 Technician. Radio and Electronic Fundamentals. 3. Ohm’s Law and Power Calculations. E. I. R. P. I. E. E=Voltage (Volts). I=Current (Amps). R=Resistance (Ohms). Reading assignment. : Chapter . 27. Homework 27.1, due Monday, Feb. 27:. OQ1, 5, 14 . Homework 27.2, due Wednesday, March 1:. OQ3, OQ6, 15, 21, 25, 26, 31, 33, 39, 44, 48, 53. Begin . our study of charges . Electric Current - . Flow of electrons through a material. Electrical Potential – . Similar to potential energy . Remember PE is . llifting. something higher against the force of gravity gives it greater potential to do work, increasing its potential energy.). Chapter. 20. Chapter 20. Circuits and Circuit Elements. Circuits and Circuit Elements. Chapter. 20. Table of Contents. Section 1 . Schematic Diagrams and Circuits. Section 2 . Resistors in Series or in Parallel. Still waiting for . scantron. results…. Electric Current. Is the . flow of electric charge. (i.e. charged particles, usually electrons) . between regions of different electric potential. . . When there is no potential difference, there is no charge flow, no current.. Comparing shocks from static electricity and electric currents is like comparing apples and oranges, they are similar but quite different at the same time.. Every year many people are injured and sometimes killed from electrocution as even small amounts of electric current can be lethal. . No Class on Wednesday March 8. Labs taught by Dr. . Mahes. on Monday and Tuesday.. No quiz on . Friday, March 10. Exam 2 on Friday, March 24, study guide posted online. Current from a battery flows steadily in one direction (direct current, DC). Current from a power plant varies sinusoidally (alternating current, AC).. 3.2.5 . E.M.F.. and Internal Resistance. A source of electrical potential energy, such as a battery, provides an electromotive force (. e.m.f. .) to drive an electron current through the circuit. . Then . Chapter 23 (Electrical Circuits). Looking ahead. :. . Next Lecture Tue Apr . 16: . . Finish Ch 23, followed by Review Session. Friday Apr . 19. : . Midterm 2. . (. Chs. : . 11, 13, 14. 1. . In . a particular cathode ray tube, the measured beam current is 30.0 . μ. A. . How many electrons strike the tube screen every 40.0 s? . 11. . An . aluminum wire having a cross-sectional area of 4.00 × 10. Electrons flow due to potential difference. If the potential difference is removed, then electrons stop flowing.. As electrons move, they bump into other atoms, this slows them down and impedes their motion..