Engineering Data
Volts
Volts = √(Watts X Ohms)
Volts = (Watts/Amps)
Volts = (Amps x Ohms)
Ohms
Ohms = (Volts/Amps)
Ohms = ((Volts²)/Watts)
Ohms = (Watts/(Amps²))
Click for Ohms Law Calculator
Amperes
Amps = (Volts/Ohms)
Amps = (Watts/Volts)
Amps = √(Watts/Ohms)
Watts
Watts = ((Volts²)/Ohms)
Watts = ((Amps²) X Ohms
Watts = (Volts X Amps)
Wattage varies directly as ratio of Voltages squared
Watts2 = Watts1 x (Volts2/Volts1)²
Resstance
Series Resistance: R total = R1 + R2 + R3
Parallel Resistance: R total = (1/(1/R1) + (1/R2) + (1/R3))
3-Phase
Definitions
VP = Phase Voltage
VL = Line Voltage
IP = Phase Current
IL = Line Current
R = Resistance of each branch
W = Wattage
Formula
3 Phase Amps = (Total Watts/(Volts X 1.732))
Wye (Balanced Load)
Open Wye (No Neutral)
Delta (Balanced Load)
Open Delta
Measurements
Perimeter
Circumference of a Circle = 2∏r
Pythagorean Theorem: a² X b² = c²
Area
Triangle = ((1/2)b X h)
Trapezoid = ((1/2)(b1 + b2)h)
Circle = ∏r²
Square = Length X Width
Surface Area
Right Cylinder = 2∏rh + 2∏r²
Sphere = 4∏r²
Volume
Rectangular Prism = Length X Width X Height
Cylinder = ∏r²h
Cone = ((1/3)∏r²h)
Sphere = ((4/3)∏r³)
Conversion
Temperature
F = (((9 X ?°C)/5)+32)
C = (((5 X ?°F) - 32)/9)
Length
1 Kilometer = 1,000 Meters
1 Meter = 100 Centimeters
1 Centimeter = 10 Millimeters
1 Mile = 5,280 Feet
Volume
1 Liter = 1,000 Milliliters
1 Gallon = 4 Quarts
1 Quart= 2 Pints
1 Pint = 2 Cups
1 Cup = 8 Ounces
Weight & Mass
1 Kilogram = 1,000 Grams
1 Gram = 1,000 Milligrams
1 Ton = 2,000 Pounds
1 Pound = 16 Ounces
Time
1 Year = 365.25 Days
1 Year = 52 Weeks