Power Formulas for AC and DC Circuit

Following are the Power Formulas in AC & DC Circuit

Sr. Description Formula
1 Power in DC Circuits P = V X I
P = I2 X R
P = V2 / R
2 Power in AC Circuit (Single Phase) P = V x I x Cosθ
P = I2 X R X Cosθ
P = V2 /R (Cosθ)
3 Power in AC Circuit (3 Phase) P = 3√ VL X IL x Cosθ
P = 3 Vp X Ip x Cosθ
P = 3I2 X R X Cosθ
P = 3 (V2/R) X Cosθ

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