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you are here : HoloGuides Home >> Knowledge >> formulas
A-Z
  A
  [A] : Ampere, unit of current
  adjacent leg
  C
  [°C] : degree centigrade
  F
  [°F] : degree Fahrenheit
  H
  hypotenuse
  O
  opposite leg
  V
  [V] : Volt, unit of voltage
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Mai 01, 2002 temperature unit conversion

°C : centigrade ; °F : Fahrenheit

C = (F - 32) * 5 / 9
F = (C * 9) / 5 + 32

Mai 01, 2002 area

A = Pi * r2 = Pi / 4 * D2
A = a * h / 2

 

Mai 01, 2002 electro (Ohm's Law)

R = rho * l / a

R : resistance in [Ohm], rho : resistivity in [Ohm*m],
 l : length in [m], a : cross sectional area in [m2]

rho of Cu (Copper) = 1.68 * 10-8 [Ohm * m]
rho of Al (Aluminum) = 2.65 * 10-8 [Ohm * m]

U = R * I

U : voltage in [V], R : resistance in [Ohm], I : current in [A]

 

Mai 01, 2002 trigonometry
o = sin(alpha) * h

a = cos(alpha) * h

sin(alpha) = o / h

cos(alpha) = a / h

tan(alpha) = o / a

a: adjacent leg, o: opposite leg, h: hypotenuse

sin(alpha) = cos(90 - alpha)

cos(alpha) = sin(90 - alpha)

sin(alpha + beta) = sin(alpha) * cos(beta) + sin(beta) * cos(alpha)

sin(alpha - beta) = sin(alpha) * cos(beta) - sin(beta) * cos(alpha)

 

Mai 01, 2002

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