Calculating Power from Your Wind Turbine
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Directions: Only input data into the cells shaded orange. After typing in a number,
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hit return and the green shaded cells will automatically calculate the product
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Equation for electrical power
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Power=V * IPower =
in Watts
in mWattsVtimesI (in Amps)
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Power= Watts0.1515030.05
Put your numbers in the orange shaded cells only
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V=Volts in Volts
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I=Current in Amps
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Ohms law
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V = I * R
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V= Voltage in Volts
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I=amps in amps
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R=resistance in ohms
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I = V/RCurrent (I)=in Ampsin mAmpsVdivided by
Resistance (in Ohms)
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0.10100330
Put your numbers in the orange shaded cells only
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Power = Voltage × Current
Power =
in Watts
in mWatts
V (squared)
divided by
Resistance (in Ohms)
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P = V × I 0.30300330
Put your numbers in the orange shaded cells only
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P = V × (V/R)
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P = (V × V)/R
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P = V2/R
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in Wattsin mWatts
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Power in the Wind
Power =20.1920,194.13
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P=½ ρ (π r2) V3
½ ρ=0.60
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P = Power in the Wind (watts)
Radius=50
Input the 'radius' of your wind turbine here in cm
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ρ = Density of the Air (kg/m3)
Radius in m0.50
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1.2 kg/m3 at sea level and 20ºC
Radius squared0.250
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r = Radius of your swept area (m)
π r20.785
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V = Wind Velocity (m/s)
Wind Velocity3.50in m/s
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π = 3.14Velocity cubed42.88
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