Introduction to Electrical & Computer Engineering Ohm’s Law

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Presentation transcript:

Introduction to Electrical & Computer Engineering Ohm’s Law Dr. Cynthia Furse University of Utah Dr. Cynthia Furse University of Utah

Ohm’s Law – Questions of the Day •What is Ohm's Law, and how do you apply it? •What are Resistance, Conductivity,–Resistivity? * What is resistance used for?

Find Currents & Voltages

Find Currents & Voltages

Resistance (R) and Resistivity (ρ) Resistance: ability to resist flow of electric current Resistance (R ) Ω (ohms) Resistivity (r) Ω/m (ohm-meters) Conductivity (σ ) m/Ω -1 All rights reserved. Do not reproduce or distribute. © 2013 National Technology and Science Press Circuits, Second Edition by Fawwaz T. Ulaby and Michel M. Maharbiz, © NTS Press, Used with Permission by the Publisher

Problem 2.1: AWG-14 Cu wire R = 17.1 ohms, T = 20C. Find length. Resistance (R ) Ω (ohms) Resistivity (r) Ω/m (ohm-meters) Conductivity (σ ) m/Ω From Table 2-2: AWG-14 d = 1.6mm A = π r = π (1.6mm / 2) 2 2 All rights reserved. Do not reproduce or distribute. © 2013 National Technology and Science Press

Circuits, Second Edition by Fawwaz T. Ulaby and Michel M Circuits, Second Edition by Fawwaz T. Ulaby and Michel M. Maharbiz, © NTS Press, Used with Permission by the Publisher

Resistor Color Codes 1 k ohm 2.4 kohm 4.3 Mohm All rights reserved. Do not reproduce or distribute. © 2013 National Technology and Science Press Circuits, Second Edition by Fawwaz T. Ulaby and Michel M. Maharbiz, © NTS Press, Used with Permission by the Publisher

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