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Science & Electronics Virtual Desk Reference


The numbers p (pi) and e:

Several tables, lists of constants, conversions, equations, methods, important numbers, and useful electrical engineering formulas is provided for ready, 'instant'  access.

p 3.141592653589793
e
2.718281828459045
log10e
0.434294481903252
loge10
2.302585092994046


SI Unit Prefixes:

    
deka (da)
10+1
hekto (h
10+2
kilo (k)
10+3
mega (M
10+6
giga (G)
10+9
tera (T)
10+12
peta (P)
10+15
exa (E)
10+18
deci (d)
10-1
centi (c)
10-2
milli (m)
10-3
micro (m)
10-6
nano (n)
10-9
pico (p)
10-12
micromicro(mm)
10-12
femto (f)
10-15
atto (a)
10-18



FCC Frequency Range Designations:


Very low frequencies (VLF) Below 30 kHz
Low frequencies (LF) 30-300 kHz
Medium frequencies (MF) 300-3,000 kHz
High frequencies (HF) 3,000-30,000 kHz
Very high frequencies (VHF) 30,000 kHz-300 MHz
Ultra high frequencies (UHF 300-3,000 MHz
Super high frequencies (SHF) 3,000-30,000 MHz
Extremely high frequencies (EHF) 30,000-300,000 MHz



Resistor Color Code:


Color First Band Second Band Third Band
Black 0 0 1
Brown 1 1 10
Red 2 2 100
Orange 3 3 1,000
Yellow 4 4 10,000
Green 5 5 100,000
Blue 6 6 1,000,000
Violet 7 7 10,000,000
Gray 8 8 100,000,000
White 9 9 --------


The fourth band indicates tolerance (accuracy):
Gold     5%
Silver    10%
None    20%


formulas, constants, conversions, equations, equations

Digital Logic:


        
AND A
B
AB
 NAND A
B
AB
 NOT A /A
0
0
0
0
0
1
0
1
0
1
0
0
1
1
1
0
1
0
0
1
0
1
1
1
1
1
1
0
  OR A
B
AB
 XOR A
B
AB
0
0
0
0
0
0
0
1
1
0
1
1
1
0
1
1
0
1
1
1
1
1
1
0





Thick Film Chip Resistors:        


Case Size
Power Rating

0201
0402
0603
0805
1206
1210
1812
2010
2512
1/20 W
1/16 W
1/10 W
1/8 W
1/4 W
1/4 W
1/2 W
1/2 W
1 W



Thin Film Chip Resistors:        


Case Size
Power Rating

0201
0402
0603
0805
1206
1210
1812
2010
2512
1/20 W
1/16 W
1/10 W
1/8 W
1/4 W
1/4 W
1/2 W
1/2 W
1 W




Resistivity Constant of Different Metals At
Approximately 680F (In Ohms per Mil-Foot):


Aluminum 19.3
Copper 10.4
Iron 72 to 84
Lead 125
Nichrome 660
Platinum 66
Silver 9.9
Tungsten 33
Zinc 36.7
            


SI Units of Length:


1 mil 0.001 inch
12 inches 1 foot    
3 feet 1 yard    
1,760 yards 1 mile (statute)    
5,280 feet 1 mile (statute)
1 centimeter 0.3937 inch
1 meter 3.28 feet
1 meter 39.37 inches
1 kilometer 3,280 feet
1 micron 10-4 centimeter
1 millimicron 10-7 centimeter
1 Angstrom 10-8 centimeter






                                         

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