EE103
Spring 2008
Lecture 1
System of units
We will use the
International System of Units
. It is based in six basic units. The
measuring units for all other physical quantities can be derived from these six basic units:
QUANTITY
BASIC UNIT
SYMBOL
Length
Meter
m
Mass
Kilogram
kg
Time
Second
s
Electric Current
Ampere
A
Temperature
Kelvin
K
Luminous Intensity
Candela
cd
Some examples
Football field
91.44 m
One thousand years
31.5 10
6
s
→
31500000 s
Diameter of the Earth
1.25 10
7
m
→
12500000 m
Mass of one electron
9.1 10
-28
g
→
0.00000000000000000000000000091 g
One light year
9.5 10
15
m
→
9500000000000000
m
Atomic distance in a crystal
10
-10
m
→
0.0000000001 m
Units are more commonly expressed using multiple and submultiple
prefixes
Prefix
Symbol
equivalent to
exa
E
10
18
peta
P
10
15
tera
T
10
12
giga
G
10
9
mega
M
10
6
kilo
K
10
3
milli
M
10
-3
micro
μ
10
-6
nano
N
10
-9
pico
P
10
-12
femto
F
10
-15
atto
A
10
-18
Electric Circuits- Basic concepts
Components
+ Sources: Batteries, power supplies
+ Elements: Lamps, resistors, integrated circuits, etc
+ Interconnections: wires, printed circuits boards

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