PHYS 102 1nd Edition Lecture 5 Outline of Last Lecture I. Calculating Coulomb ForceOutline of Current Lecture II. Electric Field linesIII. Voltage IV. Energy V. Water Current Current LectureII. Electric Field Lines A. Location relevance to charge1. Field lines are close together when charge is strong. 2. Field lines are far apart when charge is weaker. a. Example problem: Solve the force of two plus charges, that each contain 2 protons and are 5 X 10-5 meters away from each other. F = k[(q1 X q2)/(r2)] = (9 X 109)[(2 X 1.6 X 10-19)(2 X 1.6 X 10-19)]/ (5 X 10-15) = 36.8 Newtons b. F = ma 36.8 N = (4.002 )(a) = 1.66 X 10-27 kg 36.8 N = (4.002)(1.66 X 10-27)(a)a = 5.54 X 1027 m/s2In summary, Chapter 15 formulas: These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.F = k[(q1 X q2)/(r2)] AND Fg= G[(m1 X m2)/r2] III. Voltage A. Common Voltage Values 1. AA Battery = 1.5 V 2. Human Heart = 0.15 V on the skin a. AA Battery is 10x that of the heart on the skin B. Voltage/ Volts definition1. Volts are a measure of energy. 2. Voltage (V) is a measure of electric energy. a. V = energy/ charge i. Charge is also known as q. ii. The charge is one that carries the energy (electrons, protons, Na+ ions) in the body. C. Voltage applications 1. voltage: V = PE/q 2. V= the difference in electric potential V between two points (like 2 terminals of a battery) 3. Voltage, V, is called potential difference. 4. Electric potential (V) = k(q/r) a. In a battery, consider the positive side to be A and the negative side to be B. Va= k(q1/r) & vb= k(q2/r). The V = Va – Vb. IV. Energy A. Types of Energy 1. energy (E)2. kinetic energy (KE)3. potential energy (PE) V. Water CurrentA. Current Types 1. Lake a. There is no current present. b. The height of points A and B are the same. 2. Waterfalls a. There is a current present. b. The height of A is higher than point B; therefore you get a current. c. You cannot have a current without distance between the two points
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