Basic Electric Power Formula in AC And DC Load.


Basic Electric Power Formula in AC And DC Circuits

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Power Formulas in DC Circuits 


P = V x I
P = I2 x R
P = V2 / R

Power Formulas in Single Phase AC Circuits


P = V x I x Cos Ф
P = I2 x R x Cos Ф
P = V2 / R (Cos Ф)

Power Formulas in Three Phase AC Circuits


P = √3 x VL x IL x Cos Ф
P = 3 x VPh x IPh x Cos Ф
P = 3 x I2 x R x Cos Ф
P = 3 (V2 / R) x Cos Ф

Where:


P = Power in Watts
V = Voltage in Volts
I = Current in Amperes
R = Resistance in Ohms (Ω)
Cos Ф = Power Factor

Alternative formula


Formula: 

For Single Phase 

P = V × I × cos(θ) 
V = P / (I × cos(θ) 
I = P / (V × cos(θ) 

For Three Phase 

P = √3 × V × I × cos(θ) 
V = P / (3 × I × cos(θ) 
I = P / (3 × V × cos(θ) 

Where


P = Power 
θ = Power Factor Angle 
V = Voltage I = Current



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