Helpful Engineering Formulas

 

Connell Industries, Inc. assumes no liability for the use or application of the following formulas.

  • Main
  • Power--A/C Circuits
  • AC/DC Formulas
  • Motor Application
  • Centrifugal Applications
  • Fans& Blowers
  • Industry Abbreviations
  • Length Measurements
  • Square Measures
  • AWG to Metric

Ohm's Law:

 


Ohms = Volts/Amperes ( R = E / I )
Amperes = Volts/Ohms ( I = E / R )
Volts = Amperes x Ohms ( E = IR )

ohmsLaw.gif

A/C Circuits

 

acdc.gif

Motor Application
Centrafugal Application
Fans & Blowers

 

INDUSTRY ABBREVIATIONS
cm = centimeter cu. = cubic ft. = foot gl. = gallon (US)
gr. = gram Imp. = Imperial in. = inch kg. = kilogram
km. = kilometer l. = liter lb. = pound m. = meter
mi. = mile oz. = ounce qt. = quart std. = standard
US = United States yd. = yard
 ..

 

LENGTH MEASUREMENTS
    Common Usage Reciprocal Value
  1 ft. = 12 in.. 1 in. = 0.0833 ft.
    1 yd. = 3 ft. 1 ft. = 0.3333 yd.
    1 rod = 5.5000 yd. 1 yd. = 0.1818 rods
    1 furlong = 40 rods 1 rod = 0.0250 furlongs
    1 mile = 8 furlongs 1 furlong = 0.1250 mi.
    1 mi. = 5,280 ft. 1 ft. = 0.000189 mi.
    1 mi. = 1,760 yd. 1 yd. = 0.000568 mi.
    1 fathom = 6 ft. 1 ft. = 0.1667 fathom
    120 fathoms = 1 cable 1 cable = 0.00833 fathoms
    1 league = 3 mi. 1 mi. = 0.3333 leagues
    1 nautical mi. = 6076.11 ft. 1 ft. = 0.000165 natical mi.
    1 hand = 5 in. (equestrian) 1 in. = 0.2000 hands
   
METRIC
    1 in. = 2.54 cm. 1 cm. = 0.3937 in.
    1 ft. = 30.48 cm. 1 cm. = 0.0328 ft.
    1 m. = 3.2808 ft. 1 ft. = 0.3048 m.
    1 m. = 39.37 in. 1 in. = 0.0254 m.
    1 m. = 1.0936 yd. 1 yd. = 0.9144 m.
    1 rod = 5.029 m. 1 m. = 0.1988 rod
    1 km = 1000 m. 1 m. = 0.001 km.
    1 km = 0.621 mi. 1 mi. = 1.6103 km.

 

SQUARE MEASURES

Common Usage

Reciprocal Value

1 sq. ft. = 144 sq. in.

1 sq. in = 0.0069 sq. in.

1 sq. yd. = 9 sq. ft.

1 sq. ft. = 0.1111 sq. yd.

1 sq. rod = 30.25 sq. yd.

1 sq. yd. = 0.0331 sq. rods

1 sq. mi. = 640 acres

1 acre = 0.0016 sq. mi.

METRIC

1 sq. cm. = 0.1550 sq. in.

1 sq. in. = 6.452 sq. cm.

1 sq. ft. = 0.0929 sq. m.

1 sq. m. = 10.7643 sq. ft.

1 sq. m. = 1.196 sq. yd.

1 sq. yd. = 0.8361 sq. m.

1 hectare = 2.47 acres

1 acre = 0.4049 hectares

1 sq. km. = 0.386 sq. mi.

1 sq. mi. = 2.59 sq. km.

AWG to Metric Conversion - American Wire Gauge Conversion Chart

AWG mm2   AWG mm2
30 0.05   8 10
28 0.08   6 16
26 0.14   4 25
24 0.25   2 35
22 0.34   1 50
21 0.38   2/00 70
20 0.5   3/00 95
18 0.75   4/00 120
18 (UL) 1   300MCM 150
17 1   350MCM 185
16 1.5   500MCM 240
14 2.5   600MCM 300
12 4   750MCM 400
10 6   1000MCM 500
..