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 Exercises Wheel change Save Energy History Formulary Formulary Generally Axle Load Distribution Payload Distribution Braking Distance Driving Force Work/Energy Radian Measure Tension (brake) Brake Force Brake Pedal Brake Force (wheel) De-/Acceleration Braking Distance Braking Period CO2 emission Density Torque Pressure Injection Quatity Electrical Power Riding Speed Centrifugal Force Gas Speed Speed Coaxial Gearbox Lever Ratio Hollow Cylinder Stroke-bore Ratio Displacement Power Output p.l. Hydraulic Ratio Capacity Piston Speed Piston Force Force Crank Mechan. Forces Fuel Consumption 1 Fuel Consumption 2 Fuel Consumption 3 Ciruit Area Circuit Ring Circumference Clutch Pedal Power (mechanical) Power (effective) Power (indicated) Efficiency Weight Wire Resistance Steering Ratio Volumetric Efficiency Air Ratio Venturi Air Resistance Parallel Circuit Planetary Gearbox Percent Rectangle Rectangle Column Friction Force Tyre Calculation Serial Circuit Rolling Resistance Cam Dwell Dwell Period Slip Spread of Gears Climbing Resistance Ratio Circumference speed Conversions Not Coaxial Gearbox Valve Opening Area Valve Opening Angle Valve Opening Period Compression Ratio 1 Compression Ratio 2 Amount of Heat Resistance Efficiency Cube Ignition Interval Cylinder

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## Generally

The formula is very helpful with recurring arithmetic operations. Instead of again and again new find out, what is to be done with the length and width of a rectangle, in order to calculate its area, one should generally note this approach. This can happen in the form

Area = Length · Width .

If one now uses the initial letters of the internationally valid, usually terms taken from the English language for the terms area, length and width, would have to stand there

A = l · b .

A formula is thus a description, which arithmetic operations are to be applied to the designator necessary for the calculation.

### Conversation

Angel (at the wheel)° (grad)1° = 60'  (angle minutes)
1 ' = 60"
(angle seconds)
Angel (at the steering wheel)° (grad)
Compression ratio
Efficency
Air/fuel ratio
Friction
circumference/diameter3,14159 ...
Densityg/cm³1 g/cm³ = 1 kg/dm³ = 1 t/m³
(Mechanical) tensionN/mm²
aaccelerationm/s²
AAreamm², cm², dm²,
m², km²
1 km²=1.000.000 m²
=10.000 cm²
=100 dm²
bWidthmm, cm, dm, m1 m = 10 dm =
100 cm = 1000 mm
cFuel consumptionl/100 km
dDiameter, boremm, cm1 cm = 10 mm
EEnergyNm, Ws, J, kJ (Joule),
kWh
1 Nm = 1 Ws = 1 J
1 kJ = 1000 J
1 kWh = 3600 kJ
fFrequencyHz (Herz), s-1 (1/s)1 Hz = 1 Oszillation/s.
FForceN, daN, kN1 kN = 100 daN
1 daN = 10 N
1 N = 1 kg·m/s²
gAcceleration of gravity9,81 m/s²
GWeightN, daN, kN1 kN = 100 daN
1 daN = 10 N
1 N = 1 kg·m/s²
hHeightmm, cm, dm, m1 m = 10 dm = 100 cm = 1000 mm
iRatio
ICurrentA (Ampere)1 A = 1000 mA
KCapacitanceAh (Amperehours)
lLengthmm, cm, dm, m, km1 Seemeile = 1,852 km
1 Landmeile = 1,609 km
1 km = 1000 m
1 m = 10 dm = 100 cm = 1000 mm
1 Inch = 25,4 mm
mMassg, kg, t (Tonne)1 t = 1000 kg
1 kg = 1000 g
1 pound (lb) = 453,59 g
MTorqueNm (Newtonmeter)1 N · 1 m = 1 Nm
nnumbers of revolutions    s-1 (1/s)
min-1 (1/min)
1 s-1 = 60 min-1
ppressurePa (Pascal)
mbar, bar, N/cm²
1 bar = 10 N/cm²
1 bar = 1000 mbar
1 bar = 100.000 Pa
PPowerVA (Volt·Ampere),
W (Watt), kW,
PS (Horsepower)
1 W = 1 J/s = 1 Nm/s = 1 kg·m²/s³
1 W = 1 VA
1 kW = 1000 W
1 kW = 1,3596 PS
1 PS = 735,5 W
QHeat quantityNm, Ws, J, kJ (Joule)1 Nm = 1 Ws = 1 J
1 kJ = 1000 J
rRadius, lever armmm, cm, dm, m1 m = 10 dm = 100 cm = 1000 mm
RResistanceM, k, , m (Ohm)1 M = 1000 k
1 k = 1000
1 = 1000 m
sDistance, strokemm, cm, dm, m, km1 km = 1000 m
1 m = 10 dm
1 dm = 10 cm
1 cm = 10 mm
tTime (time)h, min, s1 h = 60 min
1 min = 60 s
tTemperature°C (grad Celsius)0 °C = 32 °F, 100 °C = 212 °F
TPeriodic times (second)
TTemperatureK (Kelvin)0 °C = 273 K, 100 °C = 373 K
vVelocity
(velocity)
km/h1 m/s = 3,6 km/h
1 km/h = 0,278 m/s
UVoltageV (Volt)1 V = 1000 mV
VVolumemm³, cm³ (ml),
dm³ (Liter), m³
1 m³ = 1000 dm³ (Liter)
1 dm³ (Liter) = 1000 cm³ (ml)
1 cm³ (ml) = 1000 mm³
1 barrel = 159 dm³ (Liter)
1 gallon = 3,79 dm³ (Liter)
WWorkNm, Ws, J, kJ (Joule)1 Nm = 1 Ws = 1 J
1 kJ = 1000 J

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Translator: Don Leslie - Email: lesdon@t-online.de