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

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

3. 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

4. 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
10-6
kilo k
103
milli m
10-3

5. 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

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

7. From one Unit to Another

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

9. Delicate Arch, Arches National Park, near Kanab, Utah