Dr. Cynthia Furse University of Utah Introduction to Electrical & Computer Engineering Units & Scientific Notation Dr. Cynthia Furse University of Utah

Introduction to Electrical Engineering Units & Scientific Notation Review the UNITS we will be using Review Scientific Notation Convert

International System of Units (SI) Dimension Unit Symbol Relationship Length Meter m Mass Kilogram kg Time Seconds s Temperature Kelvin K Voltage Volt V Current Ampere A Charge Coulomb C =(A)(s) Resistance Ohm Ω =V / A Capacitance Farad F = C / V Inductance Henry H = (V)(s) / A Power Watt W =(V)(A) Frequency Hertz Hz = 1 / s

Prefixes & Scientific Notation Symbol Magnitude exa E 1018 atto a 10-18 peta P 1015 femto f 10-15 tera T 1012 pico p 10-12 giga G 109 nano n 10-9 mega M 106 micro µ 10-6 kilo k 103 milli m 10-3

Typical Naming Conventions General use: Lower case letters i v or i v may or may not be time varying Time varying (t) i(t) and v(t) are time varying (not constant) Not time varying (DC): capital letters I V are DC (constant) values Bold: Something special (matrix, vector, phasor version of i(t), Laplace or Fourier Transform, etc.) I V

From Units to Scientific Notation 1mV = 1x 10 V 1 MV = 1 x 10 V 1 x 10 V / 10 = 1 MV 1 x 10 V / 10 = 1 mV -3 6 From Scientific Notation to Units 6 6 -3 -3

From one Unit to Another  

Conclusion: Units & Scientific Notation Review the UNITS we will be using Review Scientific Notation Convert from one unit to another

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